doc: add contributing

CONTRIBUTING.md

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+# Contributing
+
+Please ensure you have read the [Code of Conduct](./CODE_OF_CONDUCT.md) before making any contribution.
+
+## How to contribute
+
+### Issues
+
+Add new issues:
+- [For doubts or questions about the project](https://github.com/DevoInc/genesys-ui/issues/new?assignees=&labels=question&projects=&template=1-questions.yml).
+- [Report bugs](https://github.com/DevoInc/devo-datasource/issues/new?assignees=&labels=bug%2Ctriage&projects=&template=bug-report.yml)
+- [New features](https://github.com/DevoInc/devo-datasource/issues/new?assignees=&labels=question&projects=&template=questions.yml)
+
+### Pull requests
+Contributions are made by opening pull requests from a forked copy of the repo. See detailed instructions below.
+
+- Create a fork from the project on [Github](https://github.com/DevoInc/devo-datasource).
+- Clone the fork on your local machine.
+- Add the original repository as remote `upstream`.
+- Create a new `feat/` branch from `main`.
+- Commit messages should follow the [conventional commits specification](https://www.conventionalcommits.org/en/v1.0.0/).
+- Write or update documentation if needed.
+- Make sure `npm run test` and `npm run lint` pass.
+- Push your branch to your fork (`origin`).
+- Open a pull request from your fork targeting the project's `main` branch.
+- Wait for the pull request to be approved and merged and pull the changes from the `upstream` remote.