Update page 'REST API'

REST API.md

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+# REST API
+## Add URLs to download queue via POST request:
+``` JSON
+POST http://localhost:1730/api/download/
+Content-Type: application/json
+
+{
+    "url": "https://www.deezer.com/album/115542362"
+}
+    or
+{
+    "url": ["https://www.deezer.com/track/812778162","https://www.deezer.com/playlist/708702152","https://www.deezer.com/track/813185722"]
+}
+```
+
+## Search for a track, album, playlist or artist
+``` JSON
+POST http://localhost:1730/api/search/
+Content-Type: application/json
+
+{
+    "album": "my favourite album - my favouite artist"
+}
+    or
+{
+    "artist": "my favouite artist"
+}
+```
+
+## Retrieve tracklist for an album, artist, playlist or spotifyplaylist
+``` JSON
+POST http://localhost:1730/api/tracks/
+Content-Type: application/json
+
+{
+    "album": "my favourite album's ID"
+}
+    or
+{
+    "artist": "my favouite artist's ID"
+}
+```
+
+## Retrieve length of, and items in Download Queue
+``` JSON
+GET http://localhost:1730/api/queue/
+```