Merge pull request #1839 from sgiraudot/Github-Prefill_issues-GF

GitHub: prefill issues and pull requests

.github/CONTRIBUTING.md

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+# CGAL Resources
+
+* [Official CGAL website](http://www.cgal.org)
+* [Online manual](http://doc.cgal.org/latest/Manual/index.html)
+* [Guidelines for contributing](https://github.com/CGAL/cgal/wiki/Guidelines)
+* [Mailing lists](http://www.cgal.org/mailing_list.html)

.github/ISSUE_TEMPLATE.md

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+_Please use the following template to help us solving your issue._
+
+## Issue Details
+
+_Describe your issue. Please be specific (compilation error, runtime error, unexpected behavior, wrong results, etc.)._
+
+## Source Code
+
+_If your issue arises by using CGAL in your own source code, please provide a minimalist example that we can compile easily to reproduce the bug. If your issue arises from using a CGAL program (demo, example, etc.), please let us know which one. Helping you solving an issue is much easier and efficient if we can reproduce it._
+
+## Environment
+
+* Operating system (Windows/Mac/Linux, 32/64 bits):
+* Compiler:
+* Release or debug mode:
+* Specific flags used (if any):
+* CGAL version:
+* Boost version:
+* Other libraries versions if used (Eigen, TBB, etc.):

.github/PULL_REQUEST_TEMPLATE.md

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+_Please use the following template to help us managing pull requests._
+
+## Summary of Changes
+
+_Describe what your pull request changes to CGAL (this can be skipped if it solves an issue already in the tracker or if it is a Feature or Small Feature submitted to the CGAL Wiki)._
+
+## Release Management
+
+* Affected package(s):
+* Issue(s) solved (if any):
+* Feature/Small Feature (if any):
+