Added templates for GitHub issues and pull requests (#5836)

* Added templates for GitHub issues and pull requests
* Moved and updated CONTRIBUTING.rst

[ci skip]

.github/CONTRIBUTING.rst

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+##########################
+Contributing to django CMS
+##########################
+
+Like every open-source project, django CMS always welcomes contributions.
+
+
+*******************************
+GitHub issues and pull requests
+*******************************
+
+`GitHub issues <https://github.com/divio/django-cms/issues>`_ should only be used to report *suspected issues* in
+django CMS.
+
+It should **not** be used for reporting *security issues* - please use `security@django-cms.org
+<security@django-cms.org>`_ for those.
+
+For *help with django CMS*, please use our `users' email list <https://groups.google.com/forum/#!forum/django-cms>`_.
+
+For *feature requests*, please use our `developers' email list
+<https://groups.google.com/forum/#!forum/django-cms-developers>`_.
+
+
+**************************
+Contribution documentation
+**************************
+
+We maintain comprehensive `contribution documentation <http://docs.django-cms.org/en/stable/contributing/>`_ - please
+familiarise yourself with it.
+
+
+***************
+Security issues
+***************
+
+Security issues should not be reported **anywhere** except via our dedicated and private `security@django-cms.org
+<security@django-cms.org>`_ email address.
+
+If you think you have discovered a security issue in our code, please do not raise it on
+
+* IRC
+* GitHub
+* Twitter
+* either of our email lists
+
+or in any other public forum until we have had a chance to deal with it.
+
+
+***************
+Code of conduct
+***************
+
+django CMS is governed by a `Code of Conduct
+<http://docs.django-cms.org/en/stable/contributing/code_of_conduct.html>`_. All participants in our community and its
+various forums are expect to abide by it.
+
+
+*********
+Community
+*********
+
+You can join us online:
+
+* in our IRC channel, #django-cms, on ``irc.freenode.net``. If you don't have an IRC client, you can
+  `join our IRC channel using the KiwiIRC web client
+  <https://kiwiirc.com/client/irc.freenode.net/django-cms>`_, which works pretty well.
+* on our `django CMS users email list <https://groups.google.com/forum/#!forum/django-cms>`_ for
+  **general** django CMS questions and discussion
+* on our `django CMS developers email list
+  <https://groups.google.com/forum/#!forum/django-cms-developers>`_ for discussions about the
+  **development of django CMS**
+
+You can also follow:
+
+* the `Travis Continuous Integration build reports <https://travis-ci.org/divio/django-cms>`_
+* the `@djangocms`_ Twitter account for general announcements
+
+.. _@djangocms : https://twitter.com/djangocms

.github/ISSUE_TEMPLATE.md

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+<!-- Important!
+
+Only use this form if you suspect that you have discovered an issue in django CMS.
+
+Do not use this form for reporting security issues - please use security@django-cms.org for those.
+
+For help with django CMS, please use our users' email list: https://groups.google.com/forum/#!forum/django-cms.
+
+For feature requests, please use our developers' email list: https://groups.google.com/forum/#!forum/django-cms-developers.
+
+-->
+
+### Summary
+
+
+
+### Expected behaviour
+
+
+
+#### Actual behaviour
+
+
+
+#### Environment
+
+* Python version:
+* Django version:
+* django CMS version:

.github/PULL_REQUEST_TEMPLATE.md

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+### Summary
+
+Fixes #
+
+
+
+### Links to related discussion
+
+
+
+### Proposed changes in this pull request