Add project files.

OemanTrader.Domain/Exceptions/InvalidSymbolException.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Exceptions
+{
+    public class InvalidSymbolException : Exception
+    {
+        public string Symbol { get; set; }
+        public InvalidSymbolException(string symbol)
+        {
+            Symbol = symbol;
+        }
+
+        public InvalidSymbolException(string symbol, string? message) : base(message)
+        {
+            Symbol = symbol;
+        }
+
+        public InvalidSymbolException(string symbol, string? message, Exception? innerException) : base(message, innerException)
+        {
+            Symbol = symbol;
+        }
+
+    }
+}

OemanTrader.Domain/Models/Account.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public class Account : DomainObject
+    {
+        public User AccountHolder { get; set; }
+        public double Balance { get; set; }
+        public IEnumerable<AssetTransaction> AssetTransactions { get; set; }
+    }
+}

OemanTrader.Domain/Models/Asset.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public class Asset
+    {
+        public string Symbol { get; set; }
+        public double PricePerShare { get; set; }
+    }
+}

OemanTrader.Domain/Models/AssetTransaction.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public class AssetTransaction : DomainObject
+    {
+        public Account Account { get; set; }
+        public bool IsPurchase { get; set; }
+        public Asset Asset { get; set; }
+        public int ShareAmount { get; set; }
+        public DateTime DateProcessed { get; set; }
+    }
+}

OemanTrader.Domain/Models/DomainObject.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public class DomainObject
+    {
+        public int Id { get; set; }
+    }
+}

OemanTrader.Domain/Models/MajorIndex.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public enum MajorIndexType
+    {
+        DowJones,
+        Nasdaq,
+        SP500
+    }
+        public class MajorIndex
+    {
+        public string IndexName { get; set; }
+        public double Price { get; set; }
+        public double Changes { get; set; }
+        public MajorIndexType Type { get; set; }    
+    }
+}

OemanTrader.Domain/Models/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Models
+{
+    public class User : DomainObject
+    {
+        public string Email { get; set; }
+        public string UserName { get; set; }
+        public string Password { get; set; }
+        public DateTime DateJoined { get; set; }
+    }
+}

OemanTrader.Domain/OemanTrader.Domain.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

OemanTrader.Domain/Services/IDataService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Services
+{
+    public interface IDataService<T>
+    {
+        Task<IEnumerable<T>> GetAll();
+        Task<T> Get(int id);
+        Task<T> Create(T entity);
+        Task<T> Update(int Id, T entity);
+        Task<bool> Delete(int Id);
+    }
+}

OemanTrader.Domain/Services/IMajorIndexService.cs

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+using OemanTrader.Domain.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Services
+{
+    public interface IMajorIndexService
+    {
+        Task<MajorIndex> GetMajorIndex(MajorIndexType indexType);
+    }
+}

OemanTrader.Domain/Services/IStockPriceService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.Domain.Services
+{
+    public interface IStockPriceService
+    {
+        Task<double> GetPrice(string symbol);
+    }
+}