Added CONTRIBUTING.md

Notes on how to contribute to the project.

CONTRIBUTING.md

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+# How to Contribute
+
+## Pull Requests
+
+1. Fork the *fhooe-router-skeleton* repository.
+2. Create a new branch for each feature, improvement or bug fix.
+3. Send a pull request from each feature branch against the main branch. Create a separate branch for each issue allows for an easier review and merging process.
+
+## Style Guide
+
+All pull requests must adhere to the [PSR-12 standard](https://www.php-fig.org/psr/psr-12/).
+
+## Report Issues
+
+If you don't feel like submitting your own fix for a problem or writing your own feature code, please [submit an issue](https://github.com/Digital-Media/fhooe-router-skeleton/issues) that describes your request in detail.