añadido Context de entity y correjidos algunos temas de las entidades

Modelo/Migrations/ContextModelSnapshot.cs

@@ -0,0 +1,26 @@
+// <auto-generated />
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Modelo;
+
+#nullable disable
+
+namespace Modelo.Migrations
+{
+    [DbContext(typeof(Context))]
+    partial class ContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.7")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+#pragma warning restore 612, 618
+        }
+    }
+}