Add issue and pull request template

… and move contributing.md to .github directory as well.
Related to yeoman/yeoman#1652

.github/ISSUE_TEMPLATE.md

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+<!--
+Allo' allo'! 
+Thanks for taking your time to submit an issue.
+Please keep in mind, that Github issues are meant to be used for reporting bugs and to
+request new features.
+
+Use Stack Overflow for support: http://stackoverflow.com/questions/tagged/yeoman
+Head over to one of our Gitter rooms (https://gitter.im/yeoman/home) and ask for help if you’re unsure if you ran into a bug or if you have any other question.
+
+You would like to report a bug?
+Use the search feature to ensure that the bug hasn't been reported before.
+Please ensure to provide the following information to make sure we have all we need to address your issue.
+-->
+
+## Type of issue
+
+<!-- Feature request or bug -->
+
+<!-- Please delete the rest of the template in case of a feature request -->
+
+----
+
+## My environment
+
+* *OS version/details*: `eg. Windows 10 64-bit`
+* *Node version:* `x.x.x`
+* *npm version:* `x.x.x`
+* *Name of used Yeoman module*: `eg. yo`
+* *Version of Yeoman module:* `x.x.x`
+
+## Expected behavior
+
+<!-- Description over here -->
+
+## Current behavior
+
+<!-- Description over here -->
+
+## Steps to reproduce the behavior
+
+## Command line output
+
+```
+Paste your error output over here
+```

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Allo' allo'! 
+Thanks for taking your time to submit a pull request ❤
+
+Please make sure you read and fulfill our pull request guidelines:
+https://github.com/yeoman/yeoman/blob/master/contributing.md
+
+Additional useful information is placed on the Yeoman Website:
+http://yeoman.io/contributing/pull-request.html
+-->
+
+## Purpose of this pull request? 
+
+<!-- Put an »X« into square brackets next to item) -->
+
+[ ] Documentation update
+[ ] Bug fix 
+[ ] Enhancement
+[ ] Other, please explain:
+
+## What changes did you make?
+
+<!-- Give an overview -->
+
+## Is there anything you'd like reviewers to focus on?
+
+<!-- Just in case -->