add link to contributor guide

CONTRIBUTING.md

@@ -0,0 +1 @@
+You find all information in our [contributor guide](https://github.com/jsxc/jsxc/wiki/Contributor-Guide).

README.md

@@ -1,7 +1,8 @@
 __Bugtracker and issues:__ https://github.com/sualko/jsxc/issues<br />
 __Wiki__ https://github.com/sualko/jsxc/wiki<br />
 __Installation guide__ https://github.com/sualko/jsxc/wiki/Install-ojsxc-(owncloud)<br />
-__Screenshots__ http://www.jsxc.org
+__Screenshots__ http://www.jsxc.org<br />
+__Contributor Guide__ https://github.com/jsxc/jsxc/wiki/Contributor-Guide
 
 # Owncloud JavaScript Xmpp Client
 
@@ -9,12 +10,3 @@ Real-time chat app for OwnCloud. This app requires external XMPP server (openfir
 
 More information about features, supported protocols/browsers and planned features at [www.jsxc.org](http://www.jsxc.org/).
 
-
-## Developer notes
-
-Please execute the following commands to get a copy of the code:
-
-```
-git clone https://github.com/sualko/ojsxc/
-git submodule update --init --recursive
-```