joinRoom method Null safety
- NEJoinRoomParams params,
 - NEJoinRoomOptions options
 
Join a room. After successfully joining the room, a NERoomContext instance is returned. You can perform specific operations in the room.
params   Parameters for joining a room
options  Options for joining a room
Implementation
Future<NEResult<NERoomContext>> joinRoom(
    NEJoinRoomParams params, NEJoinRoomOptions options);