add random user turn when game started

src/index.ts

@@ -112,6 +112,9 @@ const deleteGame = (game: MancalaGame) => {
 
 function createMancalaGame(userKey1: string, userKey2: string) {
   const game = new CommonMancalaGame(generateKey(), userKey1, userKey2);
+  const random = Math.random();
+  game.turnPlayerId = random > 0.5 ? userKey1 : userKey2;
+  
   gameStore.set(userKey1, game);
   gameStore.set(userKey2, game);
   return game;