Add a readme file to the repo.

README

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-This marks the development repository for the HashRU website.

README.md

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+# HashRU Pics
+
+This is the development repository for the HashRU photo website.
+The CMS and its modules originate in [Kabuki CMS](https://aaronweb.net/projects/kabuki/), but have been extended and are maintained separately in this repository.
+
+## Requirements
+
+The Kabuki codebase requires the following PHP extensions to be enabled for full operation:
+
+* exif
+* imagick (PECL)
+* mysqli
+
+## Setup
+
+Copy `config.php.dist` to `config.php` and set-up the constants contained in the file.
+
+## Running
+
+For development purposes, simply run the `server` script provided in the root of this repository.
+This will start a PHP development server on `hashru.local:8080`.
+
+For a production environment, please set up a proper PHP-FPM environment instead.
+
+## Contributing
+
+Pull requests are welcome over at the [HashRU Gitea](https://gitea.hashru.nl/Public/pics/pulls).
+
+## License
+
+The HashRU Pics repository is licensed with a BSD 3-clause license, as is Kabuki CMS.