imports from backlog, synchronization with osgameclones

entries/open_fortress.md

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+# Open Fortress
+
+_Mod of Team Fortress 2._
+
+- Home: http://openfortress.fun/
+- State: beta
+- Keywords: remake, commercial content, inspired by Team Fortress 2, modification, multiplayer Competitive + Online + LAN + Co-op + Matchmaking
+- Code repository: https://github.com/KaidemonLP/Open-Fortress-Source.git
+- Code language: C++
+- Code license: Custom, CC-BY-NC-SA
+- Code dependencies: Source SDK
+
+## Building