andriod: add app icons

Fixes: #958
Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_chrome/android/app/src/main/AndroidManifest.xml

@@ -2,7 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <application
         android:allowBackup="true"
-        android:label="Notedeck"
+        android:label="Damus"
+        android:icon="@mipmap/ic_launcher"
         android:supportsRtl="true"
         android:theme="@style/Theme.MaterialComponents.DayNight.NoActionBar">
         <activity

crates/notedeck_chrome/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@mipmap/damusbg"/>
+  <foreground android:drawable="@mipmap/damusfg"/>
+       <!--<monochrome android:drawable="@mipmap/mono"/>-->
+</adaptive-icon>