Invitation globale work

+ tests
+ new services
+ InvitationDto and IInvitationReqest

Govor.Core/DTOs/InvitationDto.cs

@@ -0,0 +1,13 @@
+namespace Govor.Core.DTOs;
+
+public class InvitationDto
+{
+    public Guid Id { get; set; }
+    public bool IsAdmin { get; set; }
+    public bool IsActive { get; set; }
+    public string Code {get; set;}
+    public DateTime CreatedAt { get; set; }
+    public DateTime EndAt { get; set; }
+    public int MaxParticipants { get; set; }
+    public string Description { get; set; }
+}