Added a short README file

README.md

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+# Lark - a modern pure-Python parsing library
+
+Lark is a modern general-purpose Python parsing library, that focuses on simplicity and power.
+
+Lark accepts grammars as EBNF and lets you choose between two parsing algorithms:
+
+ - Earley : Parses all context-free grammars (even ambiguous ones)!
+ - LALR(1): Only LR grammars. Outperforms PLY and most if not all other pure-python parsing libraries.
+
+Both algorithms are pure-python implementations and can be used interchangably (aside for algorithmic restrictions).
+
+Lark can automagically build an AST from your grammar, without any more code on your part.
+
+
+## Lark does things a little differently
+
+1. *Separates code from grammar*: The result is parsers that are cleaner and easier to read & work with.
+
+2. *Automatically builds a tree (AST)*: Trees are always simpler to work with than state-machines. (But if you want to provide a callback for efficiency reasons, Lark lets you do that too)
+
+3. *Follows Python's Idioms*: Beautiful is better than ugly. Readability counts.
+
+
+## Features
+
+ - EBNF grammar with a little extra
+ - Earley & LALR(1)
+ - Builds an AST automagically based on the grammar
+ - Python 2 & 3 compatible
+ - Supports unicode
+
+## License
+
+Lark uses the GPL3 license.
+
+## Contact
+
+If you have any questions or want to contribute, please email me at erezshin at gmail com.