docs: add usage info to readme

README.md

@@ -1,9 +1,21 @@
 # github-info
 
-Github info in your bitbar.
+Github info in your [bitbar](https://getbitbar.com/).
 
 ![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)
 
+# Usage
+
+```
+const info = require('github-info');
+
+info({
+	username: 'w33ble',
+	token: 'not required, but highly recommended',
+	repos: [ 'org/repo', 'w33ble/emo' ]
+});
+```
+
 #### License
 
 MIT © [w33ble](https://github.com/w33ble)