[#1564] Add beginner contribution docs on 'Good for Contribution'

doc/contributing/index.rst

@@ -27,6 +27,7 @@ of contributions to CKAN:
    reviewing
 
    documentation
+   simple-code-contributions
    architecture
    css
    html

doc/contributing/simple-code-contributions.rst

@@ -0,0 +1,20 @@
+=====================================
+Projects for beginner CKAN developers
+=====================================
+
+The `'Good for Contribution' <https://github.com/ckan/ckan/issues?labels=Good+for+Contribution&state=open>`_
+label on Github lists issues which are feasible for people who aren't 
+intimately familiar with CKAN's internals. Many of them are things which would
+be extremely helpful if they got done, but the core team never seems to get
+around to them. They're all busy wrestling with the problems that do require 
+familiarity with the internals. We hope this will make it easier for more
+people to assist the CKAN project, by giving new developers places to jump in.
+
+These issues vary from simple text changes to more complicated code changes
+that require more knowledge of Python and CKAN. Do not despair if any 
+individual task seems daunting; there's probably an easier one. If you have no
+programming skills, we can still use your help with documentation or 
+translation.
+
+If you wish to take up an issue make sure to keep in touch with the team on
+the Github issue, the mailing list or IRC.