Initial data commit

Task/Classes/BBC-BASIC/classes.basic

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+      INSTALL @lib$+"CLASSLIB"
+
+      REM Declare the class:
+      DIM MyClass{variable, @constructor, _method}
+      DEF MyClass.@constructor MyClass.variable = PI : ENDPROC
+      DEF MyClass._method = MyClass.variable ^ 2
+
+      REM Register the class:
+      PROC_class(MyClass{})
+
+      REM Instantiate the class:
+      PROC_new(myclass{}, MyClass{})
+
+      REM Call the method:
+      PRINT FN(myclass._method)
+
+      REM Discard the instance:
+      PROC_discard(myclass{})