Initial data commit

Task/Inheritance-Multiple/F-Sharp/inheritance-multiple.fs

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+type Picture = System.Drawing.Bitmap // (a type synonym)
+
+// an interface type
+type Camera =
+  abstract takePicture : unit -> Picture
+
+// an interface that inherits multiple interfaces
+type Camera2 =
+  inherits System.ComponentModel.INotifyPropertyChanged
+  inherits Camera
+
+// a class with an abstract method with a default implementation
+// (usually called a virtual method)
+type MobilePhone() =
+  abstract makeCall : int[] -> unit
+  default x.makeCall(number) = () // empty impl
+
+// a class that inherits from another class and implements an interface
+type CameraPhone() =
+  inherit MobilePhone()
+  interface Camera with
+    member x.takePicture() = new Picture(10, 10)