Added readme

README.md

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+## PX4 Aerial Middleware and Flight Control Stack ##
+
+*   Official Website: http://px4.io
+*   License: BSD 3-clause (see LICENSE.md)
+*   Supported airframes:
+  * Multicopters
+  * Fixed wing
+*   Binaries (always up-to-date from master):
+  * [Downloads](https://pixhawk.org/downloads)
+*   Mailing list: [Google Groups](http://groups.google.com/group/px4users)