Improved README.

README.md

@@ -1,3 +1,14 @@
 # matrix [![Build Status](https://travis-ci.org/PX4/Matrix.svg?branch=master)](https://travis-ci.org/PX4/Matrix) [![Coverage Status](https://coveralls.io/repos/PX4/Matrix/badge.svg?branch=master&service=github)](https://coveralls.io/github/PX4/Matrix?branch=master)
 
 A simple and efficient template based matrix library.
+
+## License (BSD)
+* The Matrix library is licensed under a permissive 3-clause BSD license. Contributions must be made under the same license.
+
+## Features
+* Compile time size checking.
+* Euler angle (321), DCM, Quaternion conversion through constructors.
+* High testing coverage. 
+
+## Limitation
+* No dynamically sized matrices.