Spotify support added

docs/README.md

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+# Play-dl commands
+
+For source specific commands :-
+- [YouTube]()
+- [Spotify]()
+
+### Validate
+
+#### validate(url : `string`)
+*This checks all type of urls that are supported by play-dl.*
+
+**Returns :** `sp_track` | `sp_album` | `sp_playlist` | `yt_video` | `yt_playlist` | `false`
+
+sp = Spotify
+
+yt = YouTube
+```js
+let check = validate(url)
+
+if(!check) // Invalid URL
+
+if(check === 'yt_video') // YouTube Video
+
+if(check === 'sp_track') // Spotify Track
+```