additions (from f-droid) and some link updates

entries/spacepeng.md

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+# SpacePeng!
+
+- Home: https://gitlab.com/fgerbig/SpacePeng
+- State: mature, inactive since 2017
+- Download: https://f-droid.org/de/packages/de.fgerbig.spacepeng/
+- Platform: Windows, Linux, macOS, Android
+- Keyword: action, shooter, space
+- Code repository: https://gitlab.com/fgerbig/SpacePeng.git
+- Code language: Java
+- Code license: GPL-3.0
+- Code dependency: libGDX
+
+## Building
+
+- Build system: Gradle