Add a Console app and cosmosdb feed iterator notes

ConsoleApp/Book.cs

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+namespace ConsoleApp;
+
+using System.Collections.Generic;
+
+//public record Book(int BookId, string Title, string ISBN, DateTime PublicationDate, decimal Price, int AuthorId, Author Author, int PublisherId, Publisher Publisher, ICollection<BookCategory> BookCategories);
+
+//public record Author(int AuthorId, string Name, ICollection<Book> Books);
+
+//public record Publisher(int PublisherId, string Name, ICollection<Book> Books);
+
+//public record Category(int CategoryId, string Name, ICollection<BookCategory> BookCategories);
+
+//public record BookCategory(int BookId, Book Book, int CategoryId, Category Category);
+
+public class Book
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string? Title { get; set; }
+    public string? ISBN { get; set; }
+    public DateTime? PublicationDate { get; set; }
+    public decimal? Price { get; set; }
+
+    // Embedded documents for one-to-many relationships
+    public Author? Author { get; set; }
+    public Publisher? Publisher { get; set; }
+    public List<Category> Categories { get; set; } = [];
+}
+
+public class Author
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string? Name { get; set; }
+}
+
+public class Publisher
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string? Name { get; set; }
+}
+
+public class Category
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public string? Name { get; set; }
+}

ConsoleApp/ConsoleApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OneOf" Version="3.0.271" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\CosmosDBPartialUpdateTypeConverter.csproj" />
+  </ItemGroup>
+
+</Project>

ConsoleApp/LICENSE.txt

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+MIT License
+
+Copyright (c) [year] [fullname]
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.