update docs

README.md

@@ -1,2 +1,31 @@
 # magnet-to-torrent
 
+A tiny CLI tool to fetch torrent metadata from a magnet link and save it as a `.torrent` file.
+
+## Install
+
+```bash
+# Clone and build
+git clone https://codeberg.org/firebadnofire/magnet-to-torrent.git
+cd magnet-to-torrent
+make build
+# or:
+go build -o magnet-to-torrent main.go
+```
+
+## Usage
+
+```bash
+magnet-to-torrent [options] <magnet_link>
+```
+
+### Options
+
+* `-o <file>`      Output filename (default: `<torrent name>.torrent`)
+* `-timeout <dur>` Metadata timeout (default: `5m`)
+* `-upload`        Enable seeding after fetch (off by default)
+
+## License
+
+MIT © FireBADnoFire
+