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/appsettings.json

@@ -0,0 +1,3 @@
+{
+  "UseOnlyInMemoryDatabase": true
+}