squash a bunch of commits

Shogi.Contracts/Api/Commands/CreateSessionCommand.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Shogi.Contracts.Api;
+
+public class CreateSessionCommand
+{
+    [Required]
+    public string Name { get; set; } = string.Empty;
+    public bool IsPrivate { get; set; }
+}