added patent policy info

Author: draggett

README.md

@@ -1,4 +1,17 @@
-messaging
-=========
+This repository is the home of the **Messaging API** specification being worked on by the System Applications Working Group.
 
-The messaging API
+How to contribute?
+-
+Every one is welcome to contribute to this specification.
+Any simple editorial contribution can simply be done with a GitHub Pull Request. You can even do an inline edit of the file on GitHub.
+For more important contributions that require discussions, you are invited to start a thread in the sysapps mailing at the W3C.
+
+Note: The System Applications Working Group operates under the W3C Patent Policy which aims to enable implementations of W3C Recommendations without the need to pay royalty fees. If you want to make contributions that can be used in normative parts of our specifications, we require you to make the appropriate licensing commitments. Instructions on how to do so can be found here:
+
+http://www.w3.org/2004/01/pp-impl/58119/status
+
+Useful links
+-
+The specification: http://messaging.sysapps.org
+The SysApps WG homepage: http://www.w3.org/2012/sysapps/
+The SysApps WG mailing-list: http://lists.w3.org/Archives/Public/public-sysapps/