doc: update README.md and add lib in package

README.md

@@ -17,6 +17,7 @@ Inspired by [DatMusic](https://github.com/alashow/datmusic-api), [MyFreeMp3](htt
 *TODO*
 
 * Dowload all songs in a folder
+* Add Spotify metadatas in the m3u8 file
 * Add proper command line options
 * Rewrite this as a plugin for Ampache
 * Rewrite this as a plugin for Funkwhale
@@ -32,3 +33,11 @@ Inspired by [DatMusic](https://github.com/alashow/datmusic-api), [MyFreeMp3](htt
 
 1. Install nodejs/npm
 1. `npx vk-music-dl https://open.spotify.com/playlist/6LgeEhc97Azxq6sinJQt6w`
+
+## Usage as library
+
+```javascript
+const {main} = require('vk-music-dl/lib');
+
+main('https://open.spotify.com/playlist/6LgeEhc97Azxq6sinJQt6w');
+```

package.json

@@ -21,6 +21,7 @@
     "downloader"
   ],
   "files": [
+    "lib",
     "index.js",
     "README.md"
   ],