imports from osgameclones, added backlog and rejected lists, started libregamewiki synchronization

games/doom_retro.md

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+# DOOM Retro
+
+_Remake of Doom, Doom II._
+
+- Home: https://www.doomretro.com/
+- State: mature
+- Download: https://github.com/bradharding/doomretro/releases
+- Platform: Windows
+- Keywords: action, commercial content, inspired by Doom + Doom II, remake, requires original content
+- Code repository: https://github.com/bradharding/doomretro.git
+- Code language: C, C++
+- Code license: GPL-3.0
+- Code dependencies: SDL2
+
+## Building
+
+- Build system: CMake