github templates added - Issue and PR template

Author: moljac

.github/ISSUE_TEMPLATE.md

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+# Xamarin.Auth Issue
+
+*IF BUG, INCLUDE THIS PART:*
+
+### Version
+
+- [ ] nuget version = 
+- [ ] component version = 
+- [ ] sample
+
+
+### Steps to reproduce
+
+1.
+2.
+3.
+
+Platform:
+
+-	[] .NET version = 
+-	[] mono version = 
+
+
+### Expected behaviour
+
+Tell us what should happen
+
+### Actual behaviour
+
+Tell us what happens instead
+Can you also include a screen shot?
+
+
+
+*IF IT IS A NEW FEATURE REQUEST, INCLUDE THIS PART:*
+
+### Feature description
+
+Write a description of the feature. How should it work? How should it look?
+Include some graphics if this could help!
+

.github/PULL_REQUEST_TEMPLATE.md

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+# Xamarin.Auth Pull Request
+
+Fixes # .
+
+### Checklist
+
+- [ ] I have included examples or tests
+- [ ] I have updated the change log
+- [ ] I am listed in the CONTRIBUTORS file
+- [ ] I have cleaned up the commit history (use rebase and squash)
+
+### Changes proposed in this pull request:
+
+-
+-
+-