Add templates for repo setup

.github/PULL_REQUEST_TEMPLATE.md

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+### What
+
+Describe what you have changed and why.
+
+### How to review
+
+Describe the steps required to test the changes.
+
+### Who can review
+
+Describe who worked on the changes, so that other people can review.

CHANGELOG.md

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+### Change log

CONTRIBUTING.md

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+Contributing guidelines
+=======================
+
+### Git workflow
+
+* We use git-flow - create a feature branch from `develop`, e.g. `feature/new-feature`
+* Pull requests must contain a succinct, clear summary of what the user need is driving this feature change
+* Ensure your branch contains logical atomic commits before sending a pull request - follow the [alphagov Git styleguide](https://github.com/alphagov/styleguides/blob/master/git.md)
+* You may rebase your branch after feedback if it's to include relevant updates from the develop branch. We prefer a rebase here to a merge commit as we prefer a clean and straight history on develop with discrete merge commits for features

LICENSE

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+MIT License
+
+Copyright (c) 2018 ONS Digital
+
+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.