Create CONTRIBUTING.md

Author: nicolasnoble

CONTRIBUTING.md

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+# Introduction
+
+## Acknowledgements
+
+Thank you for considering contributing to PCSX-Redux. The aim of the project is to
+be a useful debugging and reverse engineering tool, but any sort of help is greatly
+appreciated. There are various areas of the project that can be improved, and lots
+of work is still required. Feel free to open a discussion if there's anything
+you'd like to talk about.
+
+## Licensing your contribution
+
+By submitting a pull request, you represent that you have the right to license your contribution 
+to the PCSX-Redux authors and the community, and agree by submitting the patch that 
+your contributions are licensed under the project's license.
+
+## Why should you read this guideline?
+
+Following this guideline will help you to keep contact with the PCSX-Redux team.
+This will result in shorter time to process your bug reports, suggestions and pull requests.
+
+## Ways of contributing to PCSX-Redux
+
+You may contribute in a number of ways, including:
+
+* Contributing new features or bugfixes.
+* Filing detailed bug reports.
+* Suggesting new features.
+* Contributing to the [documentation](https://pcsx-redux.consoledev.net/) in the [docs](https://github.com/grumpycoders/pcsx-redux/tree/docs) branch.
+* Contributing unit test cases.
+
+# Contributing to PCSX-Redux
+
+## Code of conduct
+
+Please read and follow the [Code of Conduct](CODE_OF_CONDUCT.md) before contributing.
+
+## Contributing documentation
+
+* Provide improvements as small as possible, as pull requests.
+* If a change in documentation structure is needed, we prefer that you file a suggestion.
+
+## Contributing code
+
+* For non-trivial issues or changes, please file an issue where we can discuss the course of action.
+* Software pull requests should be as small as possible and providing only one feature per pull request.
+* The codebase is using C++-20, so all features from there are fair game, provided it builds on all of the supported platforms. Submitting a pull request should trigger builds for all supported platforms.
+* Please try and follow the codestyle, which is enforced by the [clang-format](https://github.com/grumpycoders/pcsx-redux/blob/main/src/.clang-format) rules. Worst case scenario, a bot will issue another PR to fix the codestyle however, so no need to sweat it too much.
+
+## Filing a bug report
+
+If you find a bug, please as much as possible try to file a detailed bug report using the [issue template](https://github.com/grumpycoders/pcsx-redux/issues/new?assignees=&labels=&template=bug_report.yml).