Add project files.

OemanTrader.EntityFramework/OemanTraderDbContext.cs

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+using Microsoft.EntityFrameworkCore;
+using OemanTrader.Domain.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.EntityFramework
+{
+    public class OemanTraderDbContext : DbContext
+    {
+
+        public DbSet<User> Users { get; set; }
+        public DbSet<Account> Accounts { get; set; }
+        public DbSet<AssetTransaction> AssetTransactions { get; set; }
+        public OemanTraderDbContext(DbContextOptions options) : base(options) { }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<AssetTransaction>().OwnsOne(x => x.Asset);
+            base.OnModelCreating(modelBuilder);
+        }
+  
+    }
+}