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

entries/rfxgen.md

@@ -0,0 +1,13 @@
+# rFXGen
+
+_FX sounds generator._
+
+- Home: https://raylibtech.itch.io/rfxgen
+- State: mature
+- Platform: Windows
+- Keywords: tool, inspired by sfxr
+- Code repository: https://github.com/raysan5/rfxgen.git
+- Code language: C
+- Code license: zlib
+
+## Building