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

entries/flex_engine.md

@@ -0,0 +1,13 @@
+# Flex Engine
+
+_Game engine._
+
+- Home: https://ajweeks.com/flex-engine/
+- State: beta
+- Keywords: framework
+- Code repository: https://github.com/ajweeks/FlexEngine.git
+- Code language: C++
+- Code license: MIT
+
+## Building
+