update readme and add license

Author: Bryan Borgeson

LICENSE

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+Copyright (c) 2017 Lumen Learning
+
+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.

README.md

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+# Candela Thin CC Exports
+
+A plugin that extends Pressbooks export functionality.
+
+## Synopsis
+
+[Pressbooks](https://github.com/pressbooks/pressbooks) is a plugin that turns
+your Wordpress multisite installation into a book publishing platform. Candela
+Thin CC Exports allows users to export books as a Thin Common Cartridge. The
+plugin currently supports making both inline imsmanifests and zips, and can
+export to CC 1.2, 1.3, and thin.
+
+## Installation
+
+### Composer
+
+Coming soon ...
+
+### Manually
+
+1. Download or clone Candela Thin CC Exports into your wordpress multisite plugins directory: `/path/to/wordpress/wp-content/plugins`
+1. Log in to your Wordpress multisite instance and navigate to `Network Admin > Plugins` and activate the Candela Thin CC Exports plugin
+1. Navigate to `wp-admin/tools.php?page=candela-thin-export.php` on your Candela install in your browser
+
+## License
+
+MIT - See LICENSE for more information