Add readme

Author: micheh

README.md

@@ -0,0 +1,42 @@
+
+Gitlab Report for PHP_CodeSniffer
+---------------------------------
+
+This library adds a custom report to [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) (phpcs) to generate a codequality artifact, which can be used by Gitlab CI/CD.
+The custom report will be generated in the Code Climate format and allows Gitlab CI/CD to display the violations in the Code Quality report.
+
+## Installation
+
+Install this library using [Composer](https://getcomposer.org):
+
+```shell script
+composer require --dev micheh/phpcs-gitlab
+```
+
+Then adjust your `.gitlab-ci.yml` to run PHP_CodeSniffer with the custom reporter and to gather the codequality artifacts:
+
+```yaml
+phpcs:
+  script: vendor/bin/phpcs --report=emacs --report-\\Micheh\\PhpCodeSniffer\\Report\\Gitlab=phpcs-quality-report.json
+  artifacts:
+    reports:
+      codequality: phpcs-quality-report.json
+```
+
+The example above uses two reports, one to display in the build log (emacs) and one to generate the codequality artifact file in the Code Climate format.
+
+> **Note:** Gitlab currently does not support multiple codequality artifacts. 
+> You will not be able to display the violations of multiple tools (e.g. PHP Code Sniffer & PHPStan) in the Code Quality report.
+
+
+## References
+
+- [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer)
+- [Gitlab CI/CD Code Quality](https://docs.gitlab.com/ee/user/project/merge_requests/code_quality.html)
+- [Code Climate Specification](https://github.com/codeclimate/platform/blob/master/spec/analyzers/SPEC.md#data-types)
+
+
+## License
+
+The files in this archive are licensed under the BSD-3-Clause license.
+You can find a copy of this license in [LICENSE.md](LICENSE.md).

src/Report/GitlabReport.php renamed to src/Report/Gitlab.php

@@ -17,7 +17,7 @@
 
 use const PHP_EOL;
 
-class GitlabReport implements Report
+class Gitlab implements Report
 {
     /**
      * @param File $phpcsFile