Provide guidance for issue reporting and pull requests on Github

.github/ISSUE_TEMPLATE

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+Please answer these questions before submitting your issue. It may help !
+
+Thanks!
+
+1. What version of ejabberd are you using ?
+
+
+2. What operating system are you using ?
+
+
+3. How did you install ejabberd (source, package, distribution) ?
+
+
+4. What did not work as expected ? What that error in the log ?
+   What that unexpected behaviour ? What was the expected result ?
+

.github/PULL_REQUEST_TEMPLATE

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+We are open to contribution for ejabberd, as Github pull requests (PR).
+Here is a few points to consider before submitting your pull request.
+(You can remove the whole text after reading).
+
+1. Does this PR address an issue ?
+   Please reference it in PR description.
+
+2. Have you properly described the proposed changed ?
+
+3. Please, make sure the change is atomic and does only touch the
+   needed modules.
+   If you have other changes / fixes to provide, please make them as
+   separate PR.
+
+4. If you change or new feature involves backends,
+   did you make sure you change is compliant with all backends or
+   provide the feature for all backends ?
+   
+5. Do you provides tests ?
+   How can we check the behaviour of the code ?
+
+6. Did you consider documentation changes on project
+   processone/docs.ejabberd.im ?