Fixing error for attribute error & adding 0.G Gaiman installation information.

[Leonlit]

I encountered this error during the installation process for 0.G Gaiman. This error is the same error found in #84 .

Type: <class 'sqlalchemy.exc.ArgumentError'>
Value: Strings are not accepted for attribute names in loader options; please use class-bound attributes directly.
Traceback:
  File "C:\Users\leon\Desktop\CDDA-Game-Launcher\cddagl\ui\views\main.py", line 1167, in timeout
    new_build(self.game_version, sha256, is_stable, self.build_number,
  File "C:\Users\leon\Desktop\CDDA-Game-Launcher\cddagl\sql\functions.py", line 136, in new_build
    .options(joinedload('game_build'))
  File "C:\Users\leon\Desktop\CDDA-Game-Launcher\venv\lib\site-packages\sqlalchemy\orm\strategy_options.py", line 2359, in joinedload
    return _generate_from_keys(Load.joinedload, keys, False, kw)
  File "C:\Users\leon\Desktop\CDDA-Game-Launcher\venv\lib\site-packages\sqlalchemy\orm\strategy_options.py", line 2261, in _generate_from_keys
    raise sa_exc.ArgumentError(

The cause was by the 'joinedload' function in the 'cddagl/sql/functions.py' file. As a workaround, I used the attribute directly from the class.

[DazedNConfused-]

Howdy @Leonlit! I will get this out ASAP. Thanks a ton for your PR!