license and contributing files and update readme

CONTRIBUTING.md

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+# Contributing to SocialDB
+
+First off, thank you for considering contributing! It’s people like you who make
+this project better for everyone.
+
+By contributing to this project, you agree to abide by our Code of Conduct and
+the terms outlined below regarding licensing.
+
+## Licensing and Ownership
+
+This project is licensed under the **Mozilla Public License 2.0 (MPL-2.0)**.
+
+To ensure that we can maintain the project and potentially offer commercial
+support or "Open Core" features in the future, we require all contributors to
+agree to the following:
+
+1. **License Grant:** By submitting a Pull Request, you grant the project
+   owner(s) a non-exclusive, perpetual, worldwide, royalty-free license to
+   use, modify, and redistribute your contribution.
+2. **Dual-Licensing:** You acknowledge that the project owner(s) may choose
+   to license the project (including your contributions) under different
+   terms, including commercial or proprietary licenses, while the version
+   released under MPL-2.0 remains open source.
+3. **Attribution:** You will be credited for your contributions in the
+   version control history (Git).
+
+---
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+- Check the **Issues** tab to see if the bug has already been reported.
+- If not, open a new issue. Include a clear title, a description of the
+  problem, and steps to reproduce the bug.
+
+### Suggesting Enhancements
+
+- Open an issue with the tag `enhancement`.
+- Explain the "why" behind the feature and how it would benefit other users.
+
+### Pull Requests (PRs)
+
+1. **Fork the repo** and create your branch from `main`.
+2. **Ensure your code follows the style guide** (run `npm run lint` or
+   equivalent if applicable).
+3. **Write tests** for any new functionality.
+4. **Update documentation** if you are changing how a feature works.
+5. **Sign-off your commits**: We prefer commits to be signed (e.g.,
+   `git commit -s`) to confirm you have the right to submit the code.