fixing minor problem with readme

Adding full list of supported commands to Readme

added ability to return playername as well and to return a proper error when the user tries to enter a game they already belong to

Adding a new command to return the current game's ID

minor change on readme

Fixing several bugs, adding check for closed doors and adding more commands, such as use, and look around

adding more details on readme and ading some minor bugfixes

inital commit