Link to new contributing file and the requirements doc.

README.md

@@ -37,6 +37,8 @@ With GitLab you can:
 * gitlab-shell
 * redis
 
+More details are in the [requirements doc](https://github.com/gitlabhq/gitlabhq/blob/master/doc/install/requirements.md)
+
 ### Install
 
 Checkout [wiki](https://github.com/gitlabhq/gitlabhq/wiki) pages for installation information, migration, etc.
@@ -45,6 +47,6 @@ Checkout [wiki](https://github.com/gitlabhq/gitlabhq/wiki) pages for installatio
 
 ### [Contact](http://gitlab.org/contact/)
 
-### [Issue Submission Guide](https://github.com/gitlabhq/gitlabhq/wiki/Issue-Submission-Guide)
+### [Contributing Guide](https://github.com/gitlabhq/gitlabhq/blob/master/CONTRIBUTING.md)
 
 ### [Developer Guide](https://github.com/gitlabhq/gitlabhq/wiki/Developer-Guide)