Added README

README.md

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+FFI KDTree
+==========
+
+This is a simple FFI wrapped version of [libkdtree](https://github.com/sdeming/kdtree) for Ruby.
+
+License
+-------
+
+[New BSD license][license]
+
+Requirements
+------------
+
+* [libkdtree](https://github.com/sdeming/kdtree) 
+* ffi gem
+
+Contributing
+------------
+
+1. Fork it.
+2. Create a branch
+3. Commit your changes
+4. Push to the branch
+5. Fire off a pull request
+
+[license]: http://www.opensource.org/licenses/bsd-license.php