Add a open door to one house which should be the the main characters house in the city

[r4pt0s]

Our main character lives currently nowhere.

Pick one house in the map_city map which should be the house of the main character where it can go into.
Feel free to add a new map which you can design as you like for the main character.

For more information, have a look at #7 about creating a new map

[BrianCheung1]

Added with pull request #96