Usage explanations for readme file

README.md

@@ -1,2 +1,19 @@
 # ytMusicNotification
-Youtube Music Desktop Notification Extension for Chrome
+
+Chrome extension to get desktop notifications when the song changes in Youtube Music.
+
+## Usage
+
+After the extension installed, 
+
+- Open music.youtube.com on your browser or open the PWA for Youtube Music.
+- Activate the extension as shown in the image.
+
+![](./img/1.png)
+
+If the extension is active, a new desktop notification with info about the song will be displayed when song changes as shown in the image below.
+
+![](./img/2.png)
+
+## License
+The source code is licensed under [GNU General Public License v3.0](./LICENSE).