Initial work on getting minimal API to work

AS1024.GeoFeed.Core.SqliteGeoFeedCache/GeoFeedCacheDbContext.cs

@@ -0,0 +1,15 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace AS1024.GeoFeed.Core.GeoFeedSqliteLocalCache
+{
+    public class GeoFeedCacheDbContext : DbContext
+    {
+        public GeoFeedCacheDbContext(DbContextOptions options)
+            : base(options)
+        {
+        }
+
+        public virtual DbSet<GeoFeedCacheEntry> GeoFeedCacheEntries { get; set; }
+    }
+
+}