Add quick switch to shortcuts

src/main/AndroidManifest.xml

@@ -109,6 +109,7 @@
         </activity>
 
         <activity android:name=".ShadowsocksQuickSwitchActivity"
+                  android:label="@string/quick_switch"
                   android:launchMode="singleInstance"
                   android:excludeFromRecents="true"
                   android:taskAffinity=""

src/main/res/xml/shortcuts.xml

@@ -9,4 +9,13 @@
                 android:targetPackage="com.github.shadowsocks"
                 android:targetClass="com.github.shadowsocks.QuickToggleShortcut" />
     </shortcut>
+    <shortcut android:shortcutId="switch"
+              android:enabled="true"
+              android:icon="@mipmap/ic_launcher"
+              android:shortcutShortLabel="@string/quick_switch"
+              android:shortcutLongLabel="@string/quick_switch">
+        <intent android:action="android.intent.action.MAIN"
+                android:targetPackage="com.github.shadowsocks"
+                android:targetClass="com.github.shadowsocks.ShadowsocksQuickSwitchActivity" />
+    </shortcut>
 </shortcuts>