Docs: Adding github issue/pr templates, license and contributing

Author: renatomefi

.github/ISSUE_TEMPLATE.md

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+| Q                | A
+| ---------------- | -----
+| Bug report?      | yes/no
+| Feature request? | yes/no
+| BC Break report? | yes/no
+| RFC?             | yes/no
+| Version/Branch   | x.y.z
+
+<!--
+Please fill in this template according to your issue.
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+| Q             | A
+| ------------- | ---
+| Bug fix?      | yes/no
+| New feature?  | yes/no
+| BC breaks?    | yes/no
+| Deprecations? | yes/no
+| Tests pass?   | yes/no
+| Documented?   | yes/no
+| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
+| License       | MIT
+
+<!--
+- Please fill in this template according to the PR you're about to submit.
+- Replace this comment by a description of what your PR is solving.
+-->

CONTRIBUTING.md

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+Contributing
+============
+
+Running tests
+--------------
+
+In the bundle directory:
+
+```bash
+./vendor/bin/phpunit
+```
+
+Giving some love to PHP CS
+---------------------------
+
+```bash
+composer require --dev 'friendsofphp/php-cs-fixer:^2.0'
+bin/php-cs-fixer fix
+```

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) Overblog
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.