CLA copy in readme and PDFs in doc folder

README.md

@@ -130,3 +130,21 @@ Thanks to all developers and contributors of these projects!
 ## License
 
 The GPL version 3, read it at [http://www.gnu.org/licenses/gpl.txt](http://www.gnu.org/licenses/gpl.txt)
+
+##Contributing
+
+Cloud9 wouldn't be where it is now without contributions. Feel free to fork and improve/enhance Cloud9 in any way your want. If you feel that the Cloud9 community will benefit from your changes, please open a pull request. To protect the interests of the Cloud9 contributors and users we require contributors to sign a Contributors License Agreement (CLA) before we pull the changes into the main repository. Our CLA is the simplest of agreements, requiring that the contributions you make to an ajax.org project are only those you're allowed to make. This helps us significantly reduce future legal risk for everyone involved. It is easy, helps everyone, takes ten minutes, and only needs to be completed once.  There are two versions of the agreement:
+
+1. [The Individual CLA](https://github.com/ajaxorg/cloud9/raw/master/doc/Contributor_License_Agreement-v2.pdf): use this version if you're working on an ajax.org project in your spare time, or can clearly claim ownership of copyright in what you'll be submitting.
+2. [The Corporate CLA](https://github.com/ajaxorg/cloud9/raw/master/doc/Corporate_Contributor_License_Agreement-v2.pdf): have your corporate lawyer review and submit this if your company is going to be contributing to ajax.org projects
+
+If you want to contribute to an ajax.org project please print the CLA and fill it out and sign it. Then either send it by snail mail or fax us or send it back scanned (or as a photo) by email.
+
+Email: [email protected]
+
+Fax: +31 (0) 206388953
+
+Address: Ajax.org B.V.
+  Keizersgracht 241
+  1016 EA, Amsterdam
+  the Netherlands