Implement application shortcuts (fix #161)

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

@@ -3,6 +3,8 @@
 
     <string name="app_name">Traccar Client</string>
     <string name="app_logo">Traccar</string>
+    <string name="shortcut_start">Traccar - Start</string>
+    <string name="shortcut_stop">Traccar - Stop</string>
 
     <string name="settings_id_title">Device identifier</string>
     <string name="settings_address_title">Server address</string>
@@ -28,6 +30,7 @@
 
     <string name="menu_status">Status</string>
     <string name="menu_about">About</string>
+    <string name="menu_shortcuts">Add shortcuts</string>
     <string name="menu_clear">Clear</string>
     
     <string name="about_description">Real time GPS tracker for Android devices. Compatible with Traccar Server and other tracking systems.</string>