Add "Development" section to README.md

Author: adamlwgriffiths

README.md

@@ -69,10 +69,15 @@ Usage
 
 Check the 'examples' directory for for some example code.
 
+Development
+-----------------------
+
 <img src="http://twistedpairdevelopment.files.wordpress.com/2010/10/twisted_pair-0086.png">
 
 PyGLy is developed by [Twisted Pair Development](twistedpairdevelopment.wordpress.com).
 
+Contributions are welcome.
+
 License
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