Move from the hand.

Shogi.Contracts/Types/Session.cs

@@ -2,8 +2,8 @@
 
 public class Session
 {
-	public string Player1 { get; set; }
-	public string? Player2 { get; set; }
+	public User Player1 { get; set; }
+	public User? Player2 { get; set; }
 	public string SessionName { get; set; }
 	public BoardState BoardState { get; set; }
 }

Shogi.Contracts/Types/User.cs

@@ -1,9 +1,17 @@
-namespace Shogi.Contracts.Types
-{
-	public class User
-	{
-		public string Id { get; set; } = string.Empty;
+namespace Shogi.Contracts.Types;
 
-		public string Name { get; set; } = string.Empty;
-	}
+public class User
+{
+    public string Id { get; set; } = string.Empty;
+
+    /// <summary>
+    /// A display name for the user.
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    public User(string id, string name)
+    {
+        Id = id;
+        Name = name;
+    }
 }