Create CONTRIBUTING.md

Author: HackingRepo

CONTRIBUTING.md

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+# Contributing
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+The following is a set of guidelines for contributing to url-sheriff.
+These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Code of Conduct
+
+This project and everyone participating in it is governed by a [Code of Conduct](./CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.
+
+## How to contribute to dssrf-js
+
+By contributing to dssrf you should not compromise those rules.
+
+### Security
+Ensure your changes do not introduce security risks or new ssrf bypasses to dssrf.
+
+### Perfomance
+Ensure your changes do not slowdown dssrf or make request longer.
+
+### FPS
+Ensure your changes not introduce false positives and block legitimate traffic and urls.
+
+### Note
+your changes will be introduced in the new version after accepted in the github repo not in the actual one.
+
+### Tests
+
+Make sure the code you're adding has decent test coverage.
+
+Running project tests and coverage:
+
+```bash
+npm run test
+```