add microcharts

Billing.Shared/Views/RankPage.xaml.cs

@@ -0,0 +1,29 @@
+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();
+        }
+    }
+}