Invitation globale work

+ tests
+ new services
+ InvitationDto and IInvitationReqest

Govor.API/Services/AdminsStuff/Interfaces/IInvitionGenerator.cs

@@ -0,0 +1,6 @@
+namespace Govor.API.Services.AdminsStuff.Interfaces;
+
+public interface IInvitationGenerator
+{
+    public Task<string> GenerateInvitationCode(DateTime time, int maxUsers, bool isAdmin, string description = "");
+}

Govor.API/Services/AdminsStuff/InvitationGenerator.cs

@@ -0,0 +1,26 @@
+using Govor.API.Services.AdminsStuff.Interfaces;
+using Govor.Core.Models;
+using Govor.Core.Repositories.Invaites;
+
+namespace Govor.API.Services.AdminsStuff;
+
+public class InvitationGenerator(IInvitesRepository repository) : IInvitationGenerator
+{
+    public async Task<string> GenerateInvitationCode(DateTime time, int maxUsers, bool isAdmin, string description = "")
+    {
+        Invitation newInvitation = new Invitation()
+        {
+            Id = Guid.NewGuid(),
+            Description = description,
+            MaxParticipants = maxUsers,
+            DateCreated = DateTime.UtcNow,
+            EndDate = time.ToUniversalTime(),
+            Code = Guid.NewGuid().ToString("N"),
+            IsAdmin = isAdmin
+        };
+
+       await repository.AddAsync(newInvitation);
+        
+        return newInvitation.Code;
+    }
+}