Add license, move readme from org-mode to markdown

README.md

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+# Quality Assurance Settings for museum-digital
+
+Most of the code used at [[https://www.museum-digital.org][museum-digital]] is written in PHP. To keep a uniform code style throughout the code, we use [[https://github.com/squizlabs/PHP_CodeSniffer][PHP Code Sniffer]].
+
+## Tools used
+
+- [[https://github.com/squizlabs/PHP_CodeSniffer][php-codesniffer]]
+- [[https://github.com/phpstan/phpstan][PHPStan - PHP Static Analysis Tool]]
+- [[https://phpunit.de/][phpunit]]
+
+## This Repository
+
+This repository serves to collect generally applicable rules, that can be embedded into the specific rule sets of the different projects.
+
+The file `[md_phpcs_rules.xml](./rules/md_phpcs_rules.xml)` contains the main style guide. When rewriting files to fit the uniform style rules, ``[md_phpcs_rules_basic.xml](./rules/md_phpcs_rules_basic.xml)`` comes in handy as a first step. It contains the same rules, excluding some which require or encourage a more in-depth look at the code (the prohibition of procedural-style calls to mysqli functions is e.g. a good opportunity to check the efficiency of queries).
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](./LICENSE) file for the full license text.