docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to OSGeo
+Thank you for your interest in contributing to the Open Source Geospatial Foundation (OSGeo).
+
+
+## How to Contribute
+1. Fork this repository to your GitHub account.
+2. Clone your fork locally.
+3. Create a new branch for your changes.
+4. Make your changes with clear and meaningful commits.
+5. Push your branch to GitHub.
+6. Open a Pull Request describing your changes.
+
+
+## Contribution Guidelines
+1) Keep changes small and focused.
+2) Follow existing formatting and structure.
+3)  Ensure content is clear and professional.
+4) Be respectful and follow OSGeo community guidelines.
+
+
+## License
+By contributing to this repository, you agree that your contributions will be licensed under the same terms as the repository content.

marketing/branding/subbrands/service-providers/osgeo-matrix/README.md

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+# OSGeo-Matrix Logo
+This directory contains the OSGeo-Matrix logo, a sub-brand of OSGeo used to represent its presence on the Matrix messaging platform.
+
+
+## Files
+- `osgeo-matrix.svg` — Primary vector logo
+
+
+## Usage
+This logo may be used for:
+1) OSGeo Matrix rooms
+2) Community communication channels
+3) Related outreach material
+
+Please follow OSGeo branding guidelines when using this logo.