start integrating websocket, player basically done

backend/src/definitions.d.ts

@@ -0,0 +1,16 @@
+export interface Room {
+    playbackStatus: boolean;
+    playbackStart: number;
+    playlist: Song[];
+    playlistIndex: number;
+    roomName: string;
+    roomToken: string;
+}
+
+export interface Song {
+    title: string;
+    artist: string;
+    duration: number;
+    cover: string;
+    additionalInfo?: string;
+}