Convert CodeConventions document from MS Office to Markdown format

Because we don't need large binary blobs in the repository.

Author: amedee

CodeConventions.docx

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+# Class structure
+
+## Constants
+1. public constants (public static final)
+2. protected constants (protected static final)
+3. private constants (private static final)
+
+## Fields
+4. public fields
+5. protected fields
+6. private fields
+
+## Constructors
+7. public constructors
+8. protected constructors
+9. private constructors
+
+## Methods
+10. public static methods
+11. public methods
+12. protected static methods
+13. protected methods
+14. private static methods
+15. private methods
+
+## Internal classes
+16. public static classes
+17. public classes
+18. protected static classes
+19. protected classes
+20. private static classes
+21. private classes