make text in preview selectable, so that user can copy it

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

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

@@ -59,6 +59,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:padding="@dimen/standard_padding"
+            android:textIsSelectable="true"
             tools:text="Lorem Ipsum" />
 
     </androidx.core.widget.NestedScrollView>