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

entries/trackballs.md

@@ -0,0 +1,15 @@
+# Trackballs
+
+_Remake of Marble Madness._
+
+- Home: https://trackballs.github.io
+- State: mature
+- Download: https://repology.org/metapackage/trackballs/versions
+- Platform: Linux
+- Keywords: puzzle, inspired by Marble Madness, remake
+- Code repository: https://github.com/trackballs/trackballs.git
+- Code language: C++, Scheme
+- Code license: GPL-2.0
+- Code dependencies: Guile, SDL2
+
+## Building