Merge branch 'feature/bottom_menu' into develop

.../circles/ui/bottom_navigation/BottomNavigationFragment.kt

.../main/java/com/futo/circles/ui/circles/CirclesFragment.kt

...rc/main/java/com/futo/circles/ui/groups/GroupsFragment.kt

app/src/main/java/com/futo/circles/ui/home/HomeFragment.kt

...rc/main/java/com/futo/circles/ui/people/PeopleFragment.kt

...rc/main/java/com/futo/circles/ui/photos/PhotosFragment.kt

app/src/main/res/drawable/ic_round_contacts.xml

app/src/main/res/drawable/ic_round_home.xml

app/src/main/res/drawable/ic_round_people.xml

app/src/main/res/drawable/ic_round_photo_library.xml

app/src/main/res/layout/bottom_navigation_fragment.xml

app/src/main/res/layout/circles_fragment.xml

app/src/main/res/layout/groups_fragment.xml

app/src/main/res/layout/home_fragment.xml

app/src/main/res/layout/loading_button_view.xml

app/src/main/res/layout/people_fragment.xml

app/src/main/res/layout/photos_fragment.xml

app/src/main/res/menu/bottom_nav_menu.xml

app/src/main/res/navigation/nav_graph_bottom_menu.xml

app/src/main/res/values/strings.xml