Add contributing and security info, license under MIT

CONTRIBUTING.md

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+This project welcomes contributions!
+
+Please follow these guidelines when contributing, as it will give your pull 
+request the best chance of being accepted:
+
+# Requesting Features/Reporting Bugs
+
+- To request a new feature or to report a bug, create an 
+  [Issue](https://github.com/Pear-Trading/Foodloop-Server/issues/new).
+
+# Contributing Code
+
+- This project uses [Git Flow](https://githubflow.github.io/);
+- branch off of `development` to start developing (`git checkout -b <your branch>`);
+- ensure that your new branch has a descriptive name and begins with your username;
+- create a remote copy of your new branch (`git push`);
+- create a draft [merge request](https://github.com/Pear-Trading/Foodloop-Server/compare);
+  to merge your branch with `development` — tag any related or to-close Issues; and
+- when you think you're finished, un-draft your pull request.
+
+# Commits
+
+- This project uses [Conventional Commits](https://www.conventionalcommits.org); and
+- keep individual commits as small as possible.
+
+# Versioning
+
+- This project uses [Semantic Versioning](https://semver.org/).
+
+# Translating
+
+- Translations are welcome!

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2016 creativeLabs Lukasz Holeczek.
+
+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, andor 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.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of this software are currently being supported with 
+security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.x.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To securely report a vulnerability, please DO NOT create an Issue on this 
+repository.
+
+Please email [Mark Keating][mkeating] privately with the full details of the 
+vulnerability.
+
+[mkeating]: mailto:m.keating@shadowcat.co.uk