Create README.md

Amos Blanton · Amos Blanton · commit d626efd76e7c · 2014-08-01T13:35:44.000-04:00
diff --git a/README.md b/README.md
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+scratch-extension-docs
+======================
+
+Documentation and sample code for creating extensions with Scratch 2.0. 
+http://llk.github.io/scratch-extensions/
