additions (from f-droid) and some link updates

entries/planet_rider.md

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+# Planet Rider
+
+- Home: https://fede0d.github.io/game/2015/10/31/planet-rider.html
+- State: mature, inactive since 2015
+- Platform: Windows, Linux, Android
+- Keyword: arcade, skill
+- Code repository: https://github.com/FEDE0D/Planet-Rider.git
+- Code language: GDScript
+- Code license: GPL-3.0
+- Code dependency: Godot
+
+## Building