Add release process to contribution guidelines

Author: thibaudcolas

.github/CONTRIBUTING.md

@@ -0,0 +1,46 @@
+# Contribution Guidelines
+
+We welcome all support, whether on bug reports, feature requests, code, design, reviews, tests, documentation, and more.
+
+## Development
+
+### Install
+
+> Clone the project on your computer, and install [Node](https://nodejs.org) and [nvm](https://github.com/creationix/nvm).
+
+```sh
+# Switch to the right version of Node.
+nvm use
+# Then, install all project dependencies.
+npm install
+```
+
+Also take the time to integrate [Prettier](https://prettier.io/) and [ESLint](https://eslint.org/) with your code editor.
+
+### Working on the project
+
+> Everything mentioned in the installation process should already be done.
+
+```sh
+# Make sure you use the right node version.
+nvm use
+# View available commands with:
+npm run
+# Most used commands:
+npm run test:watch
+npm run lint
+```
+
+### Releasing a new version
+
+- Make a new branch for the new release.
+- Follow [stylelint’s semantic versioning policy](https://github.com/stylelint/stylelint/blob/master/docs/user-guide/semantic-versioning-policy.md) to determine what new version to create.
+- Update the [CHANGELOG](CHANGELOG.md).
+- If there are breaking changes, make sure to document them separately, and add any upgrade considerations.
+- Update the version number in `package.json`, following semver.
+- Make sure the documentation is up-to-date (`npm run build:docs`)
+- Make a PR and squash merge it.
+- Back on master with the PR merged, use `npm publish`.
+- Head over to [https://www.npmjs.com/package/stylelint-config-torchbox](https://www.npmjs.com/package/stylelint-config-torchbox) and check that all is well.
+- Finally, go to GitHub and create tag then a release for the new version, with the corresponding CHANGELOG entry as content.
+- Done!

CONTRIBUTING.md

@@ -312,3 +312,7 @@ To get the most out of this config, it is assumed that projects have the followi
 - [`order/properties-order`](https://github.com/hudochenkov/stylelint-order)
 
 </details>
+
+## Contributing
+
+See the [contribution guidelines](CONTRIBUTING.md) for guidance and setup instructions.

README.md

@@ -170,6 +170,10 @@ ${generateList(formatRows(disabled))}
 ${generateList(formatRows(unused))}
 
 </details>
+
+## Contributing
+
+See the [contribution guidelines](CONTRIBUTING.md) for guidance and setup instructions.
 `;
 
     const newREADME = `${README}${README_MARKER}\n${rulesDocumentation}`;