additions (from f-droid) and some link updates

entries/candy_memory.md

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+# Candy Memory
+
+- Home: https://github.com/tube42/candymem
+- State: mature, inactive since 2018
+- Download: https://f-droid.org/de/packages/se.tube42.kidsmem.android/
+- Platform: Android
+- Keyword: arcade, for kids
+- Code repository: https://github.com/tube42/candymem.git
+- Code language: Java
+- Code license: GPL-2.0
+
+## Building
+
+- Build system: Gradle