additions (from f-droid) and some link updates

entries/virus_attack.md

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+# Virus Attack
+
+- Home: https://gitlab.com/anstue/virus-attack
+- State: mature
+- Download: https://f-droid.org/de/packages/com.kokkle.gamevirusattack/
+- Platform: Android
+- Keyword: action
+- Code repository: https://gitlab.com/anstue/virus-attack.git
+- Code language: Java
+- Code license: AGPL-3.0
+
+## Building
+
+- Build system: Gradle