Class-Diagram.md

@@ -22,4 +22,12 @@ Map "*" *-- MapObject
 
 Map "1" *-- NavigationGraph
 Simulation "1" *-- MaintenanceDispatcher
+```
+
+**Model.Common**
+```plantuml
+class Vec2D {
+  + operator+(Vec2D other)
+  + operator-(Vec2D other)
+}
 ```
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