additions (from f-droid) and some link updates

entries/gl_tron.md

@@ -0,0 +1,13 @@
+# GL TRON
+
+- Home: https://github.com/Chluverman/android-gltron
+- Inspiration: GLtron
+- State: mature, inactive since 2012
+- Download: https://f-droid.org/de/packages/com.glTron/
+- Platform: Android
+- Keyword: action, racing
+- Code repository: https://github.com/Chluverman/android-gltron.git
+- Code language: Java
+- Code license: GPL-3.0
+
+## Building