add db creation

backend/src/app.py

@@ -1,6 +1,7 @@
 from flask import Flask, Response, jsonify, request
 from flask_cors import CORS
 from room import Room
+from song import init_db
 
 app = Flask(__name__)
 CORS(app)
@@ -38,4 +39,5 @@ def join():
 
 
 if __name__ == "__main__":
+    init_db()
     app.run(debug=True)