move operations AppDbContext into the shared JsonDotNetCoreExample project

having a single db  makes CI easier to configure

Author: jaredcnance

src/Examples/JsonApiDotNetCoreExample/Data/AppDbContext.cs

@@ -1,4 +1,4 @@
-using JsonApiDotNetCoreExample.Models;
+using JsonApiDotNetCoreExample.Models;
 using JsonApiDotNetCore.Models;
 using Microsoft.EntityFrameworkCore;
 
@@ -14,12 +14,12 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
             modelBuilder.Entity<TodoItem>()
                 .Property(t => t.CreatedDate).HasDefaultValueSql("CURRENT_TIMESTAMP").IsRequired();
-            
+
             modelBuilder.Entity<TodoItem>()
                 .HasOne(t => t.Assignee)
                 .WithMany(p => p.AssignedTodoItems)
                 .HasForeignKey(t => t.AssigneeId);
-            
+
             modelBuilder.Entity<TodoItem>()
                 .HasOne(t => t.Owner)
                 .WithMany(p => p.TodoItems)
@@ -34,5 +34,8 @@ protected override void OnModelCreating(ModelBuilder modelBuilder)
 
         [Resource("camelCasedModels")]
         public DbSet<CamelCasedModel> CamelCasedModels { get; set; }
+
+        public DbSet<Article> Articles { get; set; }
+        public DbSet<Author> Authors { get; set; }
     }
 }