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

games/et_legacy.md

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+# ET: Legacy
+
+_Fully compatible client and server for the online FPS game Wolfenstein: Enemy Territory._
+
+- Home: https://www.etlegacy.com/
+- State: mature
+- Download: https://www.etlegacy.com/download
+- Platform: Windows, Linux, macOS
+- Keywords: action, commercial content, inspired by Wolfenstein: Enemy Territory, remake, shooter
+- Code repository: https://github.com/etlegacy/etlegacy.git
+- Code language: C, C++, Lua
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: CMake