factorio, terraria: add page

[Managor]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):
  1.1.109

[Managor]

An experiment in creating pages for headless game servers. Factorio is usually not installed to your PATH, which is why I wrote the binary as path/to/factorio

[kbdharun]

Thanks for your contribution, LGTM after these suggestions.

[Managor]

Since this is an experimental idea, I'll add Terraria server instructions here too.

[Managor]

Asking for guidance. For the Terraria server I can use either the TerrariaServer helper script or I can run the TerrariaServer.bin.x86_64 binary directly. I want to know what name should be given to the markdown file. Should it be the game name?

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages/linux/openttd.md already exists in the common directory.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[Managor]

Ah right, OpenTTD is possible to be installed through your package manager.