add microcharts

Billing.Shared/Views/RankPage.xaml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ui:BillingPage xmlns="http://xamarin.com/schemas/2014/forms"
+                xmlns:r="clr-namespace:Billing.Languages"
+                xmlns:ui="clr-namespace:Billing.UI"
+                xmlns:v="clr-namespace:Billing.Views"
+                xmlns:chart="clr-namespace:Microcharts.Forms;assembly=Microcharts.Forms"
+                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+                x:Class="Billing.Views.RankPage"
+                x:Name="rankPage"
+                x:DataType="v:RankPage"
+                BindingContext="{x:Reference rankPage}">
+    <chart:ChartView Chart="{Binding Chart}"/>
+</ui:BillingPage>

Billing.Shared/Views/RankPage.xaml.cs

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+using Billing.UI;
+using Microcharts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace Billing.Views
+{
+    public partial class RankPage : BillingPage
+    {
+        private static readonly BindableProperty ChartProperty = Helper.Create<Chart, RankPage>(nameof(Chart));
+
+        public Chart Chart
+        {
+            get => (Chart)GetValue(ChartProperty);
+            set => SetValue(ChartProperty, value);
+        }
+
+        public RankPage()
+        {
+            InitializeComponent();
+        }
+    }
+}