add command to readme

Author: unknownuser88

README.md

@@ -3,7 +3,7 @@ Github Notifications
 
 This plugin show github notifications count in statusbar
 
-# Generating Access Token
+## Generating Access Token
 
 * Account Settings -> [Personal access tokens](https://github.com/settings/tokens)
 * "Generate new token" under "Personal access tokens"
@@ -23,6 +23,15 @@ Paste the token in the settings section under the token option.
 
 ```
 
+## Commands
+
+```javascript
+{
+    "caption": "Open Github Notifications",
+    "command": "open_github_notifications"
+}
+```
+
 ## Screenshot
 
 ![Screenshot](https://github.com/unknownuser88/github-notifications/raw/master/github-notifications.png)