Add OpenTTD/Games

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OpenTTD

• OpenTTD -
  OpenTTD is an open source simulation game based upon Transport Tycoon Deluxe.
• License: GNU General Public License version 2.0
• Why do you think this helps users privacy?: OpenTTD is a transport simulation game based upon the popular game Transport Tycoon Deluxe, written by Chris Sawyer.
  It attempts to mimic the original game as closely as possible while extending it with new features.
• Under what section should this service be listed?: Games
• Additional comments / info: Hop on now!