Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp.Core/Models/SampleCompany.cs

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+namespace TemplateStudioSampleApp.Core.Models;
+
+// Model for the SampleDataService. Replace with your own model.
+public class SampleCompany
+{
+    public string CompanyID
+    {
+        get; set;
+    }
+
+    public string CompanyName
+    {
+        get; set;
+    }
+
+    public string ContactName
+    {
+        get; set;
+    }
+
+    public string ContactTitle
+    {
+        get; set;
+    }
+
+    public string Address
+    {
+        get; set;
+    }
+
+    public string City
+    {
+        get; set;
+    }
+
+    public string PostalCode
+    {
+        get; set;
+    }
+
+    public string Country
+    {
+        get; set;
+    }
+
+    public string Phone
+    {
+        get; set;
+    }
+
+    public string Fax
+    {
+        get; set;
+    }
+
+    public ICollection<SampleOrder> Orders
+    {
+        get; set;
+    }
+}