Updating README

README.md

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 ## Slack Clone Client
+
+Based on the tutorial from https://awesomereact.com/playlists/slack-clone-using-graphql/0MKJ7JbVnFc.
+
+Online demo at http://slack-clone.craigstroman.com/.
+
+## Running locally
+
+- Clone the repo at https://github.com/craigstroman/slack-clone-client.git.
+- CD into slack-clone-client.
+- Run `npm install` to install all required Node moduels.
+- Run `npm run start` to start the client development environment.
+- You can visit http://localhost:3000 in the browser to view it. But to do anything you need the
+  [Slack Clone Server](https://github.com/craigstroman/slack-clone-server) running in another terminal window locally.
+
+Note: This is running on WebPack devServer and will automatically refresh when you make changes to the project.
+
+## Running in production
+
+- CD into slack-clone-server.
+- Run `npm run prod`.
+- This will create a production build file of the JavaScript within /public/js/main.min.js.
+- Upload the main.min.js to the /public directory within your production build of the server. For that I'm using [Pug](https://pugjs.org/api/getting-started.html) with [Express](https://expressjs.com/).