Create README.md

Author: chrisbura

README.md

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+Warning
+=========
+
+This repo is NOT compatible with the official repo at http://sourceforge.net/projects/pythoncad/
+
+The history was rewritten with `git filter-branch` to remove binary files that were over github's 100 MB limit. 
+
+    PythonCAD/Generic/Kernel/pythoncad.pdr 
+    PythonCAD/pythoncad.pdr
+
+Since the history was being rewritten anyway, other files were removed on top of the troublesome ones such as `.exe`, `.zip`, `.tar.gz`, and more. A full list will be in the wiki.