initial design of domain

theInterfacePro/Code/Core/Sprint.cs

@@ -0,0 +1,16 @@
+namespace Code.Core;
+
+public class Sprint
+{
+    public int SprintNumber { get; set; }
+    public DateTime StartDate { get; set; }
+    public DateTime EndDate { get; set; }
+    public bool IsActive { get; set; } = false;
+    public List<UserStory> UserStories { get; set; } = new List<UserStory>();
+
+    public void MarkStoryDone(UserStory userStory)
+    {
+        var story = UserStories.First(x => x.Title == userStory.Title);
+        story.IsComplete =  true;
+    }
+}