Feature/migrate to minimal api (#662)

* migrate from classic controller to minimal api

* fix all PublicApi integration test

* update all nuget package add forget project

* fix pay now

* Adapt readme use in memory database

* undo AuthenticateEndpoint to use EndpointBaseAsync

* Update README.md

Co-authored-by: Steve Smith <steve@kentsmiths.com>

Co-authored-by: Steve Smith <steve@kentsmiths.com>

tests/PublicApiIntegrationTests/ProgramTest.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Net.Http;
+
+namespace PublicApiIntegrationTests
+{
+    [TestClass]
+    public class ProgramTest
+    {
+        private static WebApplicationFactory<Program> _application;
+
+        public static HttpClient NewClient
+        {
+            get
+            {
+                return _application.CreateClient();
+            }
+        }
+
+        [AssemblyInitialize]
+        public static void AssemblyInitialize(TestContext _)
+        {
+            _application = new WebApplicationFactory<Program>();
+
+        }
+    }
+}