To Run the app, navigate to the directory "/tictactoeclient/" and run npm start from the terminal.
The game can be played online here - https://spectacular-parfait-a5649b.netlify.app/
In the above link, anyone can generate a unique room ID and share it to play the game. No one other than two players would be able to join the same room, for this mongoDB was used for storing the room IDs.