adding week 4 labs

labs/Lab3_Fragments/.gitignore

labs/Lab3_Fragments/FragmentsLabPhone.mp4

labs/Lab3_Fragments/FragmentsLabTablet.mp4

labs/Lab3_Fragments/Lab-Fragments.pdf

labs/Lab3_Fragments/app/build.gradle

...droidTest/java/course/labs/fragmentslab/test/PhoneTest.kt

...roidTest/java/course/labs/fragmentslab/test/TabletTest.kt

labs/Lab3_Fragments/app/src/main/AndroidManifest.xml

...pp/src/main/java/course/labs/fragmentslab/FeedFragment.kt

...rc/main/java/course/labs/fragmentslab/FeedFragmentData.kt

...src/main/java/course/labs/fragmentslab/FriendsFragment.kt

...pp/src/main/java/course/labs/fragmentslab/MainActivity.kt

..._Fragments/app/src/main/res/drawable-hdpi/ic_launcher.png

..._Fragments/app/src/main/res/drawable-ldpi/ic_launcher.png

..._Fragments/app/src/main/res/drawable-mdpi/ic_launcher.png

...Fragments/app/src/main/res/drawable-xhdpi/ic_launcher.png

...Fragments/app/src/main/res/layout-large/main_activity.xml

labs/Lab3_Fragments/app/src/main/res/layout/feed.xml

.../Lab3_Fragments/app/src/main/res/layout/main_activity.xml

labs/Lab3_Fragments/app/src/main/res/raw/ladygaga.txt