Create CONTRIBUTING.md

Author: cletusw

CONTRIBUTING.md

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+# Contributing
+
+This plugin needs to run in as many environments as possible. Avoid modern constructs (e.g. `let`, `const`, `import`) in favor of older ones (e.g. `var`, `require`).
+
+## Publishing
+
+To publish a new version:
+
+1. `npm version (major|minor|patch)`
+2. `git push --follow-tags`
+3. [Create a new release](https://github.com/cletusw/eslint-plugin-local-rules/releases/new) from the npm-created tag. Use the tag name for the "Release title" (e.g. "v2.0.0").
+4. The [npm-publish](.github/workflows/npm-publish.yml) GitHub Action will automatically run the tests then `npm publish` the new release to the NPM registry (https://www.npmjs.com/package/eslint-plugin-local-rules).