Adding CONTRIBUTING.md

.release-version

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-2.15.0
+2.16.0

CONTRIBUTING.md

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+# Contributing
+
+All contributions to this project are subject to the [MIT License](https://foss-haas.mit-license.org/). By submitting a contribution, you agree to license your work under these terms.
+
+## Contribution Process
+
+### 1. Issue First
+
+All contributions from outside the core team require an **Issue First** approach. Before submitting a pull request (PR), you must:
+
+- Open an issue in the repository.
+- Ensure the issue includes:
+  - **Clear problem statement:** Describe the issue or feature request.
+  - **Reproduction steps:** If reporting a bug, provide steps to reproduce it.
+  - **Proposed approach:** Outline your suggested solution or implementation.
+  - **Why this change matters:** Explain the impact or necessity of the change.
+- Tag `@sanger/psd-developers` in the issue to bring it to the attention of a maintainer.
+- Wait for the issue to be assigned or approved by a maintainer.
+
+### 2. Pull Request
+
+Once your issue is approved:
+
+- Fork the repository and create a branch for your changes.
+- Submit a PR referencing the approved issue.
+- Ensure your code adheres to the project's coding standards and passes all tests.
+
+### 3. Review
+
+Maintainers will review your PR. Address any feedback before merging.