Add tutorial

README.md

@@ -5,6 +5,18 @@
 
 Noti is a Mac OS X menu bar plugin to show the status of pull requests (merge requests). It is distributed as a plugin of [bitbar](https://getbitbar.com/).
 
+![Tutorial](https://github.com/ye11ow/noti/blob/master/docs/images/Bitbar.png?raw=true)
+
+* The background color indicate the status of the CI
+    * Green: Job passed
+    * Blue: Job is Running
+    * Red: Job failed
+* Emojis:
+    * 👍: Pull request is approved
+    * 🏃: The CI job is running
+    * 🙃: Number of pull requests that failed the CI job
+    * 💬: Number of pull reuqest comments
+
 ## Installation
 1. Make sure both `bitbar` and `python3` (>=3.6) are installed on your machine.