Document the startup procedure

Author: phillipj

README.md

@@ -2,10 +2,22 @@
 
 What's this?? ATM an experiment to see if a bot could be helpful for the Node.js project, to automate all the things!
 
+## Get it started
+
+It's required to have a [GitHub API token](https://github.com/blog/1509-personal-api-tokens) before starting the bot.
+
+```bash
+$ GITHUB_TOKEN=X npm start
+```
+
+### Create a GitHub access token
+
+Go to your own profile settings page and [generate a personal access token](https://github.com/settings/tokens/new). After clicking the **Generate token** button you're presented with the token you should put in `$GITHUB_TOKEN` when starting the bot.
+
 ## Contributing
 
 Please do, contributions are more than welcome!
 
 ## License
 
-MIT
+MIT