Initial data commit

Task/Inheritance-Single/PureBasic/inheritance-single-2.basic

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+Class Animal
+EndClass
+
+Class Dog Extends Animal
+  Public Method Bark()
+  EndMethod
+EndClass
+
+Class Cat Extends Animal
+  Public Method Sleep()
+  EndMethod
+EndClass
+
+Class Lab Extends Dog
+  Public Method Swim()
+  EndMethod
+EndClass
+
+Class Collie Extends Dog
+  Public Method Fetch()
+  EndMethod
+EndClass
+
+;- test the code
+*Lassie.Collie = NewObject.Collie
+*Lassie\Bark()
+*Lassie\Fetch()