Add changelog, license, readme

CHANGELOG.md

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+### Unreleased
+
+### v0.1.0 (2018-02-13)
+
+* First version, extracted from host project

LICENSE

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+Copyright (c) 2018, inGenerator Ltd
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
+following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
+   following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
+   disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+Warden will be a framework-independent framework for user authentication, authentication
+and management. It provides common base entities, interactors and UI across a set of packages
+that can be assembled as required.
+
+**Warden is under heavy development and not recommended for production use outwith inGenerator.**
+
+[![Build Status](https://travis-ci.org/ingenerator/warden-core.svg?branch=0.1.x)](https://travis-ci.org/ingenerator/warden-core)
+
+
+# Installing warden-core
+
+This isn't in packagist yet : you'll need to add our package repository to your composer.json:
+
+```json
+{
+  "repositories": [
+    {"type": "composer", "url": "https://php-packages.ingenerator.com"}
+  ]
+}
+```
+
+`$> composer require ingenerator/warden-core`
+
+# Contributing
+
+Contributions are welcome but please contact us before you start work on anything to check your
+plans line up with our thinking and future roadmap. 
+
+# Contributors
+
+This package has been sponsored by [inGenerator Ltd](http://www.ingenerator.com)
+
+* Andrew Coulton [acoulton](https://github.com/acoulton) - Lead developer
+
+# Licence
+
+Licensed under the [BSD-3-Clause Licence](LICENSE)