Update README.md

README.md

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 # spotify-web-notifications
 
+A Firefox extension adding now-playing style notifications to the [Spotify web interface](https://open.spotify.com/). An (unsupported) Chromium version can be found [here](https://gitlab.com/limesey/spotify-web-notifs).
+
+This extension works by scraping the web player for the necessary data, meaning that you won't need a developer account!
+
+## Table of contents
+
+- [Usage](#usage) - Instructions on how to use the extension
+
+- [Development](#development) - Development instructions
+
+## Usage
+
+TODO: Write
+
+## Development
+
 To install dependencies:
 
 ```bash
 bun install
 ```
 
-To run:
-
-```bash
-bun run index.ts
-```
-
-This project was created using `bun init` in bun v1.0.23. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.