docs: update readme

Author: rafaelbmateus

README.md

@@ -1,3 +1,35 @@
-# tuner
+# Guitar Tuner Web
 
-Basic Guitar Tuner.
+A simple and free web-based guitar tuner that can be embedded in any project.
+
+## Features
+
+🚫 No ads
+
+🎸 Easy-to-use guitar tuner
+
+💯 Completely free
+
+🌍 Works in any modern web browser
+
+🔗 Can be embedded in any website or project
+
+## How to Use
+
+Just open the tuner in your browser, click to grant microphone access,
+and pluck a string on your guitar to tune it.
+
+![image](https://github.com/user-attachments/assets/ada81d89-965e-416b-916f-519fb44d4dd2)
+
+
+## Embed in Your Project
+
+To embed this tuner in your website, use the following HTML snippet:
+
+```html
+<iframe src="https://code4music.github.io/tuner"></iframe>
+```
+
+## License
+
+This project is free to use with no restrictions.