Add demo project

CliFx.Demo/Models/Book.cs

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+using System;
+
+namespace CliFx.Demo.Models
+{
+    public class Book
+    {
+        public string Title { get; }
+
+        public string Author { get; }
+
+        public DateTimeOffset Published { get; }
+
+        public Isbn Isbn { get; }
+
+        public Book(string title, string author, DateTimeOffset published, Isbn isbn)
+        {
+            Title = title;
+            Author = author;
+            Published = published;
+            Isbn = isbn;
+        }
+    }
+}

CliFx.Demo/Models/Extensions.cs

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+using System.Linq;
+
+namespace CliFx.Demo.Models
+{
+    public static class Extensions
+    {
+        public static Library WithBook(this Library library, Book book)
+        {
+            var books = library.Books.ToList();
+            books.Add(book);
+
+            return new Library(books);
+        }
+
+        public static Library WithoutBook(this Library library, Book book)
+        {
+            var books = library.Books.Where(b => b != book).ToArray();
+
+            return new Library(books);
+        }
+    }
+}

CliFx.Demo/Models/Isbn.cs

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+using System;
+using System.Globalization;
+
+namespace CliFx.Demo.Models
+{
+    public partial class Isbn
+    {
+        public int EanPrefix { get; }
+
+        public int RegistrationGroup { get; }
+
+        public int Registrant { get; }
+
+        public int Publication { get; }
+
+        public int CheckDigit { get; }
+
+        public Isbn(int eanPrefix, int registrationGroup, int registrant, int publication, int checkDigit)
+        {
+            EanPrefix = eanPrefix;
+            RegistrationGroup = registrationGroup;
+            Registrant = registrant;
+            Publication = publication;
+            CheckDigit = checkDigit;
+        }
+
+        public override string ToString() => $"{EanPrefix:000}-{RegistrationGroup:00}-{Registrant:00000}-{Publication:00}-{CheckDigit:0}";
+    }
+
+    public partial class Isbn
+    {
+        public static Isbn Parse(string value)
+        {
+            var components = value.Split('-', 5, StringSplitOptions.RemoveEmptyEntries);
+
+            return new Isbn(
+                int.Parse(components[0], CultureInfo.InvariantCulture),
+                int.Parse(components[1], CultureInfo.InvariantCulture),
+                int.Parse(components[2], CultureInfo.InvariantCulture),
+                int.Parse(components[3], CultureInfo.InvariantCulture),
+                int.Parse(components[4], CultureInfo.InvariantCulture));
+        }
+    }
+}

CliFx.Demo/Models/Library.cs

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+using System;
+using System.Collections.Generic;
+
+namespace CliFx.Demo.Models
+{
+    public partial class Library
+    {
+        public IReadOnlyList<Book> Books { get; }
+
+        public Library(IReadOnlyList<Book> books)
+        {
+            Books = books;
+        }
+    }
+
+    public partial class Library
+    {
+        public static Library Empty { get; } = new Library(Array.Empty<Book>());
+    }
+}