Initial data commit

Task/Inheritance-Single/OxygenBasic/inheritance-single.basic

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+class animal
+  method show() as string
+  return "Animal "
+  end method
+end Class
+
+class dog
+  from Animal
+  method show() as string
+  return animal.show()+"dog "
+  end method
+end Class
+
+class cat
+  from animal
+  method show() as string
+  return animal.show()+"cat "
+  end method
+end Class
+
+class Lab
+  from dog
+  method show() as string
+  return dog.show()+"Lab "
+  end method
+end Class
+
+class Collie
+  from dog
+  method show() as string
+  return dog.show()+"Collie "
+  end method
+end Class
+
+
+Collie c
+print c.show 'result: Animal Dog Collie