Added custom readme with class diagram

implemented_readme.adoc

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+= Things about the completed assignment:
+
+== Class Diagram:
+[plantuml]
+----
+@startuml
+
+abstract class Shape {
+  # static int _nextId
+  # const double DefaultLineThickness
+  + int Id { get }
+  # Point Position
+  # Point Scale
+  # double? LineThickness
+  # IBrush? LineColor
+  # IBrush? FillColor
+  # Shape(Point, Point, double?, IBrush?, IBrush?)
+  + {abstract} bool DrawSelf(Point, Point, double?, IBrush?, IBrush? )
+  + {abstract} bool PointInShape(Point mousePoint)
+}
+
+class Square {
+  - const int SideLengthMin
+  - const int SideLengthMax
+  + Square(Point, Point, double?, IBrush?, IBrush?)
+  + override bool DrawSelf(Point, Point scale, double?, IBrush?, IBrush?)
+  + override bool PointInShape(Point)
+}
+
+class Rectangle {
+  - const int SideLengthMin
+  - const int SideLengthMax
+  + Rectangle(Point, Point, double?, IBrush?, IBrush?)
+  + override bool DrawSelf(Point, Point, double?, IBrush?, IBrush?)
+  + override bool PointInShape(Point)
+}
+
+class Circle {
+  - const int RadiusMin
+  - const int RadiusMax
+  + Circle(Point, Point, double?, IBrush?, IBrush?)
+  + override bool DrawSelf(Point, Point, double?, IBrush?, IBrush?)
+  + override bool PointInShape(Point)
+}
+
+class Triangle {
+  - const int SideLengthMin
+  - const int SideLengthMax
+  + Triangle(Point, Point, double?, IBrush?, IBrush?)
+  + override bool DrawSelf(Point, Point, double?, IBrush?, IBrush?)
+  + override bool PointInShape(Point)
+  - static Point[] CalculateTriangleVertices(Point, double)
+  - static bool IsPointInTriangle(Point, Point, Point, Point)
+}
+
+class ShapeGenerator {
+  - double _maxX
+  - double _maxY
+  - int _nextShape
+  - Random _random
+  - const int MinShapeIdx
+  - const int MaxShapeIdx
+  - static readonly IBrush[] colors
+  + ShapeGenerator(double, double)
+  + Shape CreateNewShape(Point)
+}
+
+class Program {
+  - List<Shape> shapes
+  - ShapeGenerator generator
+  + void Run()
+  + void HandleClick(ClickEvent)
+  + void Redraw()
+}
+
+Shape <|-- Square
+Shape <|-- Rectangle
+Shape <|-- Circle
+Shape <|-- Triangle
+ShapeGenerator ..> Shape : creates >
+Program o-- ShapeGenerator
+Program o-- "*" Shape : contains >
+
+@enduml
+----
+
+== Side notes:
+
+- Feature: When it attempts to create a new shape out of the bounds of the canvas, it fails and notifies the user