Add a quit confirmation dialog

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

@@ -56,6 +56,8 @@
     <!-- General strings -->
     <string name="ip_hint">IP address of GeForce PC</string>
     <string name="searching_pc">Searching for PCs…</string>
+    <string name="yes">Yes</string>
+    <string name="no">No</string>
     
     <!-- AppList activity -->
     <string name="title_applist">Apps on</string>
@@ -70,7 +72,8 @@
     <string name="applist_quit_app">Quitting</string>
     <string name="applist_quit_success">Successfully quit</string>
     <string name="applist_quit_fail">Failed to quit</string>
-    
+    <string name="applist_quit_confirmation">Are you sure you want to quit the running app? All unsaved data will be lost.</string>
+
     <!-- Add computer manually activity -->
     <string name="title_add_pc">Add PC Manually</string>
     <string name="msg_add_pc">Connecting to the PC…</string>