start classes

lessons/Classes.md

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+# Creating Classes
+
+This lesson is going to use the same code from last time to explain 
+the class structure itself.
+
+Since the example languages can have quite different styles of
+class declaration, I will just give a basic explanation here and then
+discuss every language in detail in their own description file.
+
+Classes are blueprints for the objects you create. You define how the
+object will look like and more importantly for the computer how much
+space it will use in memory.
+
+