chore: add CONTRIBUTING.md

Author: thelindat

CONTRIBUTING.md

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+# Contributing to our projects
+
+We welcome you to contribute to our projects, whether reporting a bug, suggesting an improvement, or submitting fixes, improvements, or new code. To ensure a smooth collaboration process please follow these guidelines.
+
+## Found a bug?
+
+### Search for existing issues
+
+Before creating a new issue, please search existing [issues](https://github.com/overextended/ox_lib/issues) to see if it has already been reported.
+
+### Add details to existing issues
+
+If you have found an **active** issue which matches your own, please provide any additional details or context that might help us to resolve it.
+
+### Create a new issue
+
+If there is no **open** issue addresing your bug, please create a new issue - you can also reference a **closed** issue if you are certain they are related. Make sure to:
+
+- Use the bug report template when creating an issue.
+- Include a descriptive title and a clear and detailed description of the problem.
+- Provide simple steps to reproduce the bug.
+- Include all relevant code samples.
+- Provide any additional information that could help diagnose the problem.
+
+## Patched a bug?
+
+- Submit a new pull request that includes **only the changes related to the fix**.
+- Clearly explain the problem being addressed and how your solution fixes it.
+- Reference any open issues or pull requests that your changes will resolve.
+
+## Suggesting improvements or new features
+
+Not all suggested improvements or features will be accepted.
+
+Changes may be declined if they do not align with our design philosophy, are incomplete, not well-planned, or introduce unnecessary complexity or breaking changes to the codebase.
+
+### Open an issue
+
+Open a new issue to discuss your suggestion, and wait for feedback from the community and maintainers.
+
+### Submit a draft
+
+If you have started working on your idea, feel free to submit a **draft pull request** to gather initial feedback.
+
+### Cosmetic changes
+
+Pull requests that do not contribute meaningful improvements to the project's stability or functionality, such as changes to formatting or unused variables, will not be accepted.
+
+## How to submit a pull request
+
+- Fork the repository and, optionally, create a new branch for your changes.
+- If applicable, include example code to demonstrate your changes.
+- Ensure your code's style is consistent with the project, e.g. uses the same indentation and string quotations.
+- If you have modified or introduced new APIs, open a pull request to our [documentation](https://github.com/overextended/overextended.github.io). We will not accept undocumented code.
+
+## Contributor License Agreement
+
+This Contributor License Agreement ("Agreement") is entered into between the contributor ("Contributor") and Overextended ("Owner") for the purpose of contributing to this repository (the "Project").
+
+By submitting any code, documentation, or other materials (collectively, the "Contribution") to this project, the Contributor agrees to the following terms:
+
+1. **License Grant**  
+    Subject to the Contributor retaining all ownership rights in their Contribution, the Contributor hereby grants the Owner a perpetual, irrevocable, worldwide, non-exclusive license to:
+
+   - Use, reproduce, modify, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Contribution,
+   - Incorporate the Contribution into the Project or any derivative works thereof, **under the terms of the Project's License**.
+
+2. **Representation and Warranties**  
+   The Contributor represents and warrants that:
+   - The Contribution is original and is the Contributor's own work.
+   - The Contribution does not violate any third-party rights, including copyright, patent, trademark, or trade secret rights.
+   - The Contributor has full power and authority to enter into this Agreement and grant the rights herein.
+
+By submitting a Contribution to the Project, the Contributor acknowledges that they have read, understood, and agree to be bound by the terms of this Agreement.