Added README

Author: mumez

README.md

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+msgpack-smalltalk
+=================
+
+MessagePack serialization library for various Smalltalk dialects.
+
+We are moving from [Google Code site](http://code.google.com/p/messagepack-st/). Old contents are still there.
+
+Currently, we have just put a [Cypress](https://github.com/CampSmalltalk/Cypress/blob/master/README.md)-based repository for the neutral accesses from various Smalltalk dialects.
+