docs: update README.md

Author: hellsontime

README.md

@@ -1,6 +1,6 @@
 # scdl
 
-A simple command-line SoundCloud downloader written in Go.
+A simple command-line & library downloader for SoundCloud tracks written in Go.
 
 ## Installation
 
@@ -13,6 +13,10 @@ Or build from source:
 ```bash
 go build -o scdl cmd/scdl/main.go
 ```
+or 
+```bash
+make build-os-arch
+```
 
 ## Usage