Improve icons

app/src/debug/res/values/colors.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-  <color name="colorPrimary">#CA241F</color>
-  <color name="colorPrimaryDark">#A12521</color>
+  <color name="colorPrimary">#c0700a</color>
+  <color name="colorPrimaryDark">#945a10</color>
   <color name="colorAccent">#ffaf3b</color>
+
+  <color name="colorIconLight">#e79102</color>
+  <color name="colorIconDark">#994e12</color>
 </resources>

app/src/main/res/drawable-v26/ic_launcher_background.xml

+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+  android:shape="rectangle">
+  <gradient
+    android:angle="270"
+    android:endColor="@color/colorIconDark"
+    android:startColor="@color/colorIconLight"
+    android:type="linear" />
+</shape>

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

 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-  <background android:drawable="@color/colorPrimary" />
+  <background android:drawable="@drawable/ic_launcher_background" />
   <foreground android:drawable="@mipmap/ic_launcher_foreground" />
 </adaptive-icon>