initial

Billing/Billing.Android/Resources/AboutResources.txt

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+Images, layout descriptions, binary blobs and string dictionaries can be included 
+in your application as resource files.  Various Android APIs are designed to 
+operate on the resource IDs instead of dealing with images, strings or binary blobs 
+directly.
+
+For example, a sample Android app that contains a user interface layout (main.xml),
+an internationalization string table (strings.xml) and some icons (drawable-XXX/icon.png) 
+would keep its resources in the "Resources" directory of the application:
+
+Resources/
+    drawable-hdpi/
+        icon.png
+
+    drawable-ldpi/
+        icon.png
+
+    drawable-mdpi/
+        icon.png
+
+    layout/
+        main.xml
+
+    values/
+        strings.xml
+
+In order to get the build system to recognize Android resources, set the build action to
+"AndroidResource".  The native Android APIs do not operate directly with filenames, but 
+instead operate on resource IDs.  When you compile an Android application that uses resources, 
+the build system will package the resources for distribution and generate a class called
+"Resource" that contains the tokens for each one of the resources included. For example, 
+for the above Resources layout, this is what the Resource class would expose:
+
+public class Resource {
+    public class drawable {
+        public const int icon = 0x123;
+    }
+
+    public class layout {
+        public const int main = 0x456;
+    }
+
+    public class strings {
+        public const int first_string = 0xabc;
+        public const int second_string = 0xbcd;
+    }
+}
+
+You would then use R.drawable.icon to reference the drawable/icon.png file, or Resource.layout.main 
+to reference the layout/main.xml file, or Resource.strings.first_string to reference the first 
+string in the dictionary file values/strings.xml.

Billing/Billing.Android/Resources/mipmap-anydpi-v26/icon.xml

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

Billing/Billing.Android/Resources/mipmap-anydpi-v26/icon_round.xml

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

Billing/Billing.Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="launcher_background">#FFFFFF</color>
+    <color name="colorPrimary">#183153</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

Billing/Billing.Android/Resources/values/styles.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<resources>
+
+  <style name="MainTheme" parent="MainTheme.Base">
+    <!-- As of Xamarin.Forms 4.6 the theme has moved into the Forms binary -->
+    <!-- If you want to override anything you can do that here. -->
+    <!-- Underneath are a couple of entries to get you started. -->
+
+    <!-- Set theme colors from https://aka.ms/material-colors -->
+    <!-- colorPrimary is used for the default action bar background -->
+    <!--<item name="colorPrimary">#2196F3</item>-->
+    <!-- colorPrimaryDark is used for the status bar -->
+    <!--<item name="colorPrimaryDark">#1976D2</item>-->
+    <!-- colorAccent is used as the default value for colorControlActivated
+         which is used to tint widgets -->
+    <!--<item name="colorAccent">#FF4081</item>-->
+  </style>
+</resources>