Implemented invitation logic. Implemented play list method. Mild refactoring.

src/index.ts

@@ -3,6 +3,7 @@ import user from './routes/user';
 import player from './routes/player';
 import game from './routes/game';
 import { OkResponse } from './utilities/responseHelper';
+import invite from './routes/invite';
 
 const server = Bun.serve({
     routes: {
@@ -10,6 +11,7 @@ const server = Bun.serve({
         ...user,
         ...player,
         ...game,
+        ...invite,
         '/test': {
             GET: () => {
                 return new OkResponse();