Initial data commit

Task/Inheritance-Multiple/Wren/inheritance-multiple.wren

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+class Camera {
+    construct new() {}
+    snap() { System.print("taking a photo") }
+}
+
+class Phone {
+    construct new() {}
+    call() { System.print("calling home") }
+}
+
+class CameraPhone is Camera {
+    construct new(phone) { _phone = phone } // uses composition for the Phone part
+    // inherits Camera's snap() method
+    // Phone's call() method can be wrapped
+    call() { _phone.call() }
+}
+
+var p = Phone.new()
+var cp = CameraPhone.new(p)
+cp.snap()
+cp.call()