Lab3 added

Labs/Lab3_Activity/.gitignore

Labs/Lab3_Activity/Lab-Activity.pdf

Labs/Lab3_Activity/LabActivity.mp4

Labs/Lab3_Activity/app/.gitignore

Labs/Lab3_Activity/app/build.gradle

Labs/Lab3_Activity/app/proguard-rules.pro

Labs/Lab3_Activity/app/src/main/AndroidManifest.xml

...app/src/main/java/course/labs/activitylab/MainActivity.kt

...p/src/main/java/course/labs/activitylab/SecondActivity.kt

.../app/src/main/res/drawable-v24/ic_launcher_foreground.xml

...vity/app/src/main/res/drawable/ic_launcher_background.xml

Labs/Lab3_Activity/app/src/main/res/layout/activity_main.xml

...Lab3_Activity/app/src/main/res/layout/activity_second.xml

...tivity/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

.../app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

...b3_Activity/app/src/main/res/mipmap-hdpi/ic_launcher.webp

...ivity/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp

...b3_Activity/app/src/main/res/mipmap-mdpi/ic_launcher.webp

...ivity/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp

...3_Activity/app/src/main/res/mipmap-xhdpi/ic_launcher.webp