additions from backlog and conversions to git

entries/a2x.md

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+# a2x
+
+_C game framework._
+
+- Home: https://github.com/alxm/a2x
+- State: beta
+- Platform: Windows, Linux
+- Keywords: puzzle, game framework
+- Code repository: https://github.com/alxm/a2x.git
+- Code language: C, Python, C++
+- Code license: GPL-3.0
+
+Developer: Alex Margarit
+
+## Building
+
+- Build system: Make