Update README

README.md

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+# github-actions
+
+## Creating javascript actions
+Please follow the official GitHub docs [here](https://docs.github.com/en/actions/creating-actions/creating-a-javascript-action#commit-tag-and-push-your-action-to-github)
+and use `@vercel/ncc` to compile the action into one `dist/index.js` file.  Do not commmit `node_modules` directory as it contains loads of files.
+
+### TL;DR 
+
+* install vercel with `npm install -g @vercel/ncc`
+* create `src/index.js` and `action.yml` files
+* run `npm install`
+* run `ncc build src/index.js`
+* commit `src/index.js`, `dist/index.js` and `action.yml`