docs: init CONTRIBUTING.md

Signed-off-by: Wing-Kam Wong <wingkwong.code@gmail.com>

.github/CONTRIBUTING.md

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+# NocoDB Contributing Guide
+
+Thanks for spending your time to contribute! The following is a set of guidelines for contributing to NocoDB. 
+
+- [Code of Conduct](https://github.com/nocodb/nocodb/blob/master/.github/CODE_OF_CONDUCT.md)
+- [Pull Request Guidelines](#pull-request-guidelines)
+- [Development Setup](#development-setup)
+- [Project Structure](#project-structure)
+- [Financial Contribution](#financial-contribution)
+- [Credits](#credits)
+
+## Pull Request Guidelines
+
+- When you create a PR, you should fill in all the info defined in this [template](https://github.com/nocodb/nocodb/blob/master/.github/pull_request_template.md).
+
+- The `master` branch is just a snapshot of the latest stable release. All development should be done in dedicated branches. 
+**Do not submit PRs against the `master` branch.**
+
+- Checkout a topic branch from the relevant branch, e.g. `develop`, and merge back against that branch.
+
+- Multiple small commits are allowed on the PR - They will be squashed into one commit before merging.
+
+- If your changes are related to a special issue, add `ref: #xxx` to link the issue where xxx is the issue id.
+
+## Development Setup
+
+Please refer to [Development Setup](https://github.com/nocodb/nocodb#development-setup).
+
+### Committing Changes
+
+We encourage all contributors to commit messages following [commit message convention](./COMMIT_CONVENTION.md).
+
+## Project Structure
+
+Please refer to [NocoDB Repository Structure](https://docs.nocodb.com/#nocodb-repository-structure).
+
+## Financial Contribution
+
+Isn't this product cool? We are working on this full time. Your donations will definitely help us to make this even better.
+
+- [Funding NocoDB's work on Github](https://github.com/sponsors/nocodb)
+
+## Credits
+
+Once again. Thank you to all the people who have already contributed to NocoDB!