New Buttons (#5)

Added two new buttons to the player:
 - Favorite song button
 - Queue mode button

Reviewed-on: #5

Navidrome.py

@@ -80,3 +80,18 @@ class NavidromeAPI:
 
         return [SubSonic.Album(album_d) for album_d in response.json()]
 
+    def getSong(self, id: str):
+        url = self.base_url + '/api/song?'
+
+        payload = {
+            "id" : id
+        }
+
+        response = requests.get(url + self._encodePayload(payload), headers=self.auth_header)
+
+        return response.json()
+
+    def isSongStarred(self, id: str) -> bool:
+        info = self.getSong(id)
+
+        return info[0]['starred']