Res: Add add shortcut adaptive icon

Signed-off-by: Fung Gwo <fython@163.com>

Author: fython

mobile/src/main/res/drawable-anydpi-v26/ic_shortcut_add.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/grey_200"/>
+    <foreground android:drawable="@drawable/ic_shortcut_add_foreground"/>
+</adaptive-icon>

mobile/src/main/res/drawable/ic_shortcut_add_foreground.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="108dp"
+        android:height="108dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <group
+        android:scaleX="0.444"
+        android:scaleY="0.444"
+        android:translateX="6.6"
+        android:translateY="6.6">
+        <path
+            android:fillColor="@color/pink_700"
+            android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"/>
+    </group>
+</vector>