additions (from f-droid) and some link updates

entries/glxy.md

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+# GLXY
+
+- Home: https://github.com/KaeruCT/GLXY
+- State: mature
+- Download: https://f-droid.org/de/packages/com.kaeruct.glxy/
+- Platform: Android
+- Keyword: simulation
+- Code repository: https://github.com/KaeruCT/GLXY.git
+- Code language: Java
+- Code license: Apache-2.0
+
+## Building
+
+- Build system: Gradle