Move color to common file

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

@@ -5,4 +5,6 @@
     <color name="primary_dark">#2E7D32</color>
     <color name="accent">#388E3C</color>
 
+    <color name="ic_launcher_background">#43A047</color>
+
 </resources>

app/src/main/res/values/ic_launcher_background.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-  <color name="ic_launcher_background">#43A047</color>
-</resources>