add Contributing

CONTRIBUTING.md

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+# CONTRIBUTING to Nalanda
+
+Thank you ❤️ for considering contributing to Nalanda. Below are some guidelines to help you along the way.
+
+## Code of Conduct
+
+We have adopted a code of conduct that we expect project participants to adhere to. Please read the [Code of Conduct](CODE_OF_CONDUCT.md) before contributing.
+
+## Getting Started
+
+### Setting up local environment
+
+1. **Fork/clone**: If you are new to Github, read [this](https://docs.github.com/en/get-started/quickstart/fork-a-repo) to learn how to fork a repository.
+
+1. **Clone** your fork locally ad navigate to the directory.
+
+```sh
+cd nalanda
+```
+
+1. **Install** the dependencies using pnpm. Read instructions [here](https://pnpm.io/installation#using-corepack) to enable pnpm in your local machine.
+
+```sh
+pnpm install
+```
+
+1. After making changes, you can **build** the library using:
+
+```sh
+pnpm run build
+```
+
+## Documentation
+
+Documentation lives in the `documentation` directory.
+
+## Testing
+
+Before submitting any changes, ensure that:
+
+All existing tests pass.
+
+```sh
+pnpm run test
+```
+
+There are no lint errors.
+
+```sh
+pnpm run lint
+```
+
+New features or changes include corresponding tests.
+
+## Questions?
+
+If you have any questions, feel free to [open an issue](https://github.com/<repository-owner>/nalanda/issues/new) or reach out to the maintainers. Your feedback and contributions are valuable to us!
+
+---
+
+Thank you for helping us improve Nalanda! 🚀