additions from backlog

games/libre_pinball.md

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+# Libre Pinball
+
+_Pinball game._
+
+- Home: https://github.com/Calinou/libre-pinball
+- State: beta, inactive since 2015
+- Keywords: sports, open content
+- Code repository: https://github.com/Calinou/libre-pinball.git
+- Code language: GDScript
+- Code license: MIT
+- Code dependencies: Godot engine
+- Assets license: CC0, CC-BY-SA-3.0
+
+## Building
+