Add support for game Fallout 76

[TDarkShadow]

This template is useful to add basic support using https://github.com/ModOrganizer2/modorganizer-basic_games.

If you are vaguely familiar with programming you can try following the instructions on that link to get something working yourself. If you have trouble with that please fill in this template.

Please provide the following information for the game (remove the optional lines you do not use):

• Name: Fallout 76
• Short name: fallout76
• Nexus ID [optional]: 2590
• Executable: Fallout76.exe
• Launcher [optional]: Fallout76.exe
• Data path: Data
• Documents path: Documents\My Games\Fallout 76
• Saves directory [optional]: Documents\My Games\Fallout 76\Saves (unused since this is a MMO game.)
• Save extension [optional]: n/a
• Steam ID [optional]: 1151340

Provide additional details regarding the game that could be required for the plugin.
The game is mostly based upon Fallout 4, and therefore the Fallout 4 branch should mostly work for Fallout 76 virtualization.