Create CONTRIBUTING.md

Author: tclindner

CONTRIBUTING.md

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+# Contributing
+
+## System Dependencies
+
+### Node
+
+* [Node.js](https://nodejs.org/) - v12.0.0+
+* [npm](https://www.npmjs.com/) - v6.0.0+
+
+## Install project dependencies
+
+### Code
+
+* Fork and clone the sentry-release-deploy-action repo
+
+### Install project dependencies
+
+`npm install`
+
+This installs dependencies from `package.json`.
+
+## npm scripts
+
+`npm run lint`
+
+This will:
+
+* run linters
+
+`npm test`
+
+This will:
+
+* run all of the jest tests
+
+`npm build`
+
+This will:
+
+* uses ncc to compile a single module with all necessary dependencies
+
+## Code guidelines
+
+### JS
+
+sentry-release-deploy-action utilizes ESLint to enforce JavaScript standards. Please see the `.eslintrc.json` file for ESLint config.
+
+* [eslint](https://github.com/eslint/eslint)
+
+#### Checking coding style
+
+Run `npm run lint` before committing to ensure your changes follow our coding standards.
+
+## Versioning
+
+Please use the following commands to increment the package's version numbers
+Ex: Assume current version is 0.0.1
+
+`npm version patch --no-git-tag-version`
+
+If you run this command the version will increase the patch number (ie 0.0.2)
+
+`npm version minor --no-git-tag-version`
+
+If you run this command the version will increase the minor number (ie 0.1.0)
+
+`npm version major --no-git-tag-version`
+
+If you run this command the version will increase the major number (ie 1.0.0)
+
+
+## EditorConfig
+
+EditorConfig helps maintain consistent file formatting between different editors and developers. Please [install the plugin for you editor of choice](https://editorconfig.org/#download). Please see the `.editorconfig` file at the root of this repo to see what settings are enforced.
+
+## License
+
+Contributions to sentry-release-deploy-action are subject to the [MIT License](https://github.com/tclindner/sentry-release-deploy-action/blob/master/LICENSE).