diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..5c98b42
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,2 @@
+# Default ignored files
+/workspace.xml
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b84db91
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+### Overview
+![](overview.png)
\ No newline at end of file
diff --git a/overview.png b/overview.png
new file mode 100644
index 0000000..ffdf1a4
Binary files /dev/null and b/overview.png differ
diff --git a/overview.uxf b/overview.uxf
new file mode 100644
index 0000000..36606d3
--- /dev/null
+++ b/overview.uxf
@@ -0,0 +1,358 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<diagram program="umlet" version="13.3">
+  <zoom_level>10</zoom_level>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>180</x>
+      <y>390</y>
+      <w>330</w>
+      <h>610</h>
+    </coordinates>
+    <panel_attributes>Host
+lt=.</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>540</x>
+      <y>390</y>
+      <w>150</w>
+      <h>610</h>
+    </coordinates>
+    <panel_attributes>Modem
+bg=#B39DDB</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>720</x>
+      <y>390</y>
+      <w>300</w>
+      <h>610</h>
+    </coordinates>
+    <panel_attributes>Hosted
+lt=.</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>260</x>
+      <y>410</y>
+      <w>950</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+fg=red</panel_attributes>
+    <additional_attributes>10.0;10.0;930.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>1190</x>
+      <y>390</y>
+      <w>90</w>
+      <h>610</h>
+    </coordinates>
+    <panel_attributes>Client</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>740</x>
+      <y>440</y>
+      <w>260</w>
+      <h>540</h>
+    </coordinates>
+    <panel_attributes>JAR
+bg=#90CAF9
+layer=-1</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>480</y>
+      <w>310</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(1) available</panel_attributes>
+    <additional_attributes>290.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>530</y>
+      <w>310</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(3.1) picked?</panel_attributes>
+    <additional_attributes>290.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>760</x>
+      <y>480</y>
+      <w>220</w>
+      <h>110</h>
+    </coordinates>
+    <panel_attributes>List of Hosts
+bg=white
+transparency=0</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>970</x>
+      <y>510</y>
+      <w>240</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(2) pick</panel_attributes>
+    <additional_attributes>10.0;20.0;220.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>550</y>
+      <w>310</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(3.2) picked!</panel_attributes>
+    <additional_attributes>10.0;20.0;290.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>700</y>
+      <w>330</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(4) GET 1
+fg=blue</panel_attributes>
+    <additional_attributes>310.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>950</x>
+      <y>720</y>
+      <w>260</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(5) GET 8080
+fg=blue</panel_attributes>
+    <additional_attributes>10.0;20.0;240.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>770</y>
+      <w>330</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(7) OK 1 (8080)
+fg=blue</panel_attributes>
+    <additional_attributes>10.0;20.0;310.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>760</x>
+      <y>630</y>
+      <w>100</w>
+      <h>330</h>
+    </coordinates>
+    <panel_attributes>Host
+GET
+Buffer
+lt=.</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>880</x>
+      <y>630</y>
+      <w>100</w>
+      <h>300</h>
+    </coordinates>
+    <panel_attributes>Client
+GET
+Buffer
+lt=.</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>430</x>
+      <y>430</y>
+      <w>50</w>
+      <h>550</h>
+    </coordinates>
+    <panel_attributes>JAR
+bg=#90CAF9</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>830</y>
+      <w>330</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(8) GET (Data)
+fg=blue</panel_attributes>
+    <additional_attributes>310.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>950</x>
+      <y>870</y>
+      <w>260</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(10) 200 (Data)
+fg=blue</panel_attributes>
+    <additional_attributes>240.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>780</x>
+      <y>710</y>
+      <w>60</w>
+      <h>90</h>
+    </coordinates>
+    <panel_attributes>GET 1
+transparency=0</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>900</x>
+      <y>720</y>
+      <w>60</w>
+      <h>190</h>
+    </coordinates>
+    <panel_attributes>GET
+8080
+bg=white
+transparency=0</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>830</x>
+      <y>740</y>
+      <w>90</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+fg=blue
+(6)</panel_attributes>
+    <additional_attributes>10.0;20.0;70.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>780</x>
+      <y>830</y>
+      <w>60</w>
+      <h>110</h>
+    </coordinates>
+    <panel_attributes>GET
+Data
+transparency=0</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>830</x>
+      <y>850</y>
+      <w>90</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+fg=blue
+(9)</panel_attributes>
+    <additional_attributes>70.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>470</x>
+      <y>900</y>
+      <w>330</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(11) OK
+fg=blue</panel_attributes>
+    <additional_attributes>10.0;20.0;310.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>200</x>
+      <y>410</y>
+      <w>70</w>
+      <h>440</h>
+    </coordinates>
+    <panel_attributes>App
+bg=#A5D6A7</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>260</x>
+      <y>780</y>
+      <w>190</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(7.1) GET 8080
+fg=blue</panel_attributes>
+    <additional_attributes>10.0;20.0;170.0;20.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>260</x>
+      <y>810</y>
+      <w>190</w>
+      <h>40</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;&lt;-
+(7) OK (Data)
+fg=blue</panel_attributes>
+    <additional_attributes>170.0;20.0;10.0;20.0</additional_attributes>
+  </element>
+</diagram>