feature: add leanback for android tv compatiblity

V2rayNG/app/src/main/res/mipmap-anydpi-v26/ic_banner.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_banner_background"/>
+    <foreground>
+        <inset android:drawable="@mipmap/ic_banner_foreground" android:inset="10%"/>
+    </foreground>
+</adaptive-icon>

V2rayNG/app/src/main/res/values/ic_banner_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_banner_background">#FFFFFF</color>
+</resources>