Initial skeleton work of periodic on disk caching

AS1024.GeoFeed/AS1024.GeoFeed.csproj

@@ -9,6 +9,11 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.0" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.19.5" />
   </ItemGroup>
 

AS1024.GeoFeed/GeoFeedBuilder/GeoFeedCacheService.cs

@@ -0,0 +1,26 @@
+
+using System.ComponentModel.DataAnnotations;
+using AS1024.GeoFeed.Models;
+using Microsoft.EntityFrameworkCore;
+
+public class GeoFeedCacheService : IHostedService
+{
+    public Task StartAsync(CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException();
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        throw new NotImplementedException();
+    }
+}
+
+public class GeoFeedCacheEntry : IPGeoFeed {
+    [Key]
+    public int Id { get; set; }
+}
+
+public class GeoFeedCacheDbContext : DbContext {
+    public virtual DbSet<GeoFeedCacheEntry> GeoFeedCacheEntries {get;set;}
+}