Hi Dakshil,
You can start a game or stop a game, but you can not pause a game. The reason for not providing this feature is to improve game experience for all players. Suppose one of your player pauses the game. Then all other players have to wait for that player to resume the game and make a turn. This can lead to a lot more waiting for other players which can lower the game experience.
If you are using latest SDK i.e. 1.10 you will be able to set a custom logic for next turns. From 1.10 onwards, developer can start game with any player and can even change the sequence of turns. They will still have the ability to not to have a custom logic and let us control the sequence of turns as it used to work earlier in older SDKs.
Thanks