Merge pull request #1655 from CPAN-API/leo/gh_issue_page

Add ISSUE template to help clarify what sorts of issues we want

Author: oalders

CONTRIBUTING.md renamed to .github/CONTRIBUTING.md

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+# Important, please read:
+
+MetaCPAN's main developers want to focus on fixing bugs and improving the existing core system.
+
+For this reason if you have a feature you would like to see added (there are load's we would love to have), please only open an issue _IF_ you are prepared to do the work to impliment it.
+
+Otherwise please add it to our wishlist: https://github.com/CPAN-API/cpan-api/wiki/Wishlist and someone may get to it one day.
+
+For more details on issues and contributing please see CONTRIBUTING.md (linked above).