Documentation : Add GitHub notes to README.

Signed-off-by: Scott Lovenberg <scott.lovenberg@gmail.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

README

@@ -100,7 +100,23 @@ Related packages include:
 CONTRIBUTIONS
 =============
 
-If you want to contribute to the development of the software then
+1. To contribute via GitHub
+  - fork the official Samba team repository on GitHub
+      * see https://github.com/samba-team/samba
+  - become familiar with the coding standards as described in README.Coding
+  - make sure you read the Samba copyright policy
+      * see https://www.samba.org/samba/devel/copyright-policy.html
+  - create a feature branch
+  - make changes
+  - when committing, be sure to add signed-off-by tags
+      * see https://wiki.samba.org/index.php/CodeReview#commit_message_tags
+  - send a pull request for your branch through GitHub
+  - this will trigger an email to the samba-technical mailing list
+  - discussion happens on the samba-technical mailing list as described below
+  - more info on using Git for Samba development can be found on the Samba Wiki
+      * see https://wiki.samba.org/index.php/Using_Git_for_Samba_Development
+
+2. If you want to contribute to the development of the software then
 please join the mailing list. The Samba team accepts patches
 (preferably in "diff -u" format, see http://samba.org/samba/devel/ 
 for more details) and are always glad to receive feedback or