Fix proguard

Author: Berrysoft

tunet-gui/android/.gitignore

@@ -8,6 +8,7 @@
 .externalNativeBuild
 .cxx
 local.properties
+key.properties
 
 gradle-wrapper.jar
 gradle-daemon-jvm.properties

tunet-gui/android/app/proguard-rules.pro

@@ -3,3 +3,4 @@
 -keep, includedescriptorclasses class com.google.android.material.button.** { *; }
 -keep, includedescriptorclasses class rs.compio.winio.Activity { *; }
 -keep, includedescriptorclasses class androidx.activity.result.** { *; }
+-keep, includedescriptorclasses class io.github.berrysoft.tunet.** { *; }