feat: initial CONTRIBUTING.md draft (#958)

CONTRIBUTING.md

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+# Contribution Guidelines
+
+When contributing to `orval`, whether on GitHub or in other community spaces:
+
+- Be respectful, civil, and open-minded.
+- Before opening a new pull request, try searching through the [issue tracker](https://github.com/anymaniax/orval/issues) for known issues or fixes.
+- If you want to make code changes based on your personal opinion(s), make sure you open an issue first describing the changes you want to make, and open a pull request only when your suggestions get approved by maintainers.
+
+## How to Contribute
+
+### Prerequisites
+
+In order to not waste your time implementing a change that has already been declined, or is generally not needed, start by [opening an issue](https://github.com/anymaniax/orval/issues/new) describing the problem you would like to solve.
+
+### Setup your environment locally
+
+_Some commands will assume you have the Github CLI installed, if you haven't, consider [installing it](https://github.com/cli/cli#installation), but you can always use the Web UI if you prefer that instead._
+
+In order to contribute to this project, you will need to fork the repository:
+
+```bash
+gh repo fork anymaniax/orval
+```
+
+then, clone it to your local machine:
+
+```bash
+gh repo clone <your-github-name>/orval
+```
+
+### Implement your changes
+
+When making commits, make sure to follow the [conventional commit](https://www.conventionalcommits.org/en/v1.0.0/) guidelines, i.e. prepending the message with `feat:`, `fix:`, `chore:`, `docs:`, etc... You can use `git status` to double check which files have not yet been staged for commit:
+
+```bash
+git add <file> && git commit -m "feat/fix/chore/docs: commit message"
+```
+
+### When you're done
+
+When all that's done, it's time to file a pull request to upstream:
+
+**NOTE**: All pull requests should target the `main` branch.
+
+## Credits
+
+This documented was inspired by the contributing guidelines for [create-t3-app](https://github.com/t3-oss/create-t3-app/blob/next/CONTRIBUTING.md).