Implement dark theme support

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

@@ -4,6 +4,6 @@
     <color name="primary">#43A047</color>
     <color name="primary_dark">#2E7D32</color>
     <color name="accent">#388E3C</color>
-    <color name="white">#FFFFFF</color>
+    <color name="light">#FFFFFF</color>
 
 </resources>

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
         <item name="colorPrimary">@color/primary</item>
         <item name="colorPrimaryDark">@color/primary_dark</item>
         <item name="colorAccent">@color/accent</item>