add readmy and some cleanup

Services/DbInitializer.cs

@@ -1,7 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using JsonFlatFileDataStore;
 using mstdnCats.Models;
 

Services/RunCheck.cs

@@ -1,4 +1,3 @@
-
 using JsonFlatFileDataStore;
 using Microsoft.Extensions.Logging;
 using mstdnCats.Models;