add top-level readme

README.md

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+Welcome to MIT Proto, a spatial computing language developed primarily at MIT and BBN Technologies. 
+
+This distribution of MIT Proto contains:
+
+* **proto:** main project, including language, compiler, simulator, code libraries, manuals, and examples
+* **webproto:** JavaScript simulator suitable for running in a browser
+* **plugin_example:** a template for building MIT Proto plugins
+* **odedyanmics:** a plugin that provides physics simulation using the ODE physics engine
+* **build_files:** helper files for building and testing
+
+This distribution is being preserved primarily for reference, as we now recommend use of the successor language Protelis: [http://protelis.github.io/](http://protelis.github.io/)