Create CONTRIBUTING.md

Author: EdOverflow

CONTRIBUTING.md

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+# Contributing
+
+Contributions from the public are welcome.
+
+### Using the issue tracker 💡
+
+The issue tracker is the preferred channel for bug reports and features requests. [![GitHub issues](https://img.shields.io/github/issues/EdOverflow/security-txt.svg?style=flat-square)](https://github.com/EdOverflow/security-txt/issues)
+
+### Issues and labels 🏷
+
+The bug tracker utilizes several labels to help organize and identify issues.
+
+### Guidelines for bug reports 🐛
+
+Use the GitHub issue search — check if the issue has already been reported.