fix join command and remove command bug and update docs (#904)

* feat:new command "join" and "remove" to force join or remove avatar in your current team

* fix:change MaxAvatarsInTeam from 9 to 4

* feat:update & merge branch.Translate fix

* fix(command):fix remove command a stupid bug.Loop delete element bug.

* fix(command):fix join command. When adding avatars, repeat avatars skip and non repeat avatars join.

* fix(language):fix join command remove command translate

* fix(ReadMe):update README.md join and remove command.