renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/proquake_4.md

@@ -0,0 +1,13 @@
+# ProQuake 4
+
+_Remake of Quake._
+
+- Home: http://quakeone.com/proquake/
+- State: mature, inactive since 2018
+- Download: http://quakeone.com/proquake/older_versions/
+- Keywords: remake, inspired by Quake
+- Code repository: http://quakeone.com/proquake/older_sources/ (source downloads)
+- Code language: C
+- Code license: GPL-2.0
+
+## Building