Created endpoints to manage groups

BeReadyBackend/DTO/Groups/CreateGroupDto.cs

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+namespace BeReadyBackend.DTO.Groups;
+
+public class CreateGroupDto
+{
+    public string? Label { get; set; }
+    public string? Title { get; set; }
+    public string? Description { get; set; }
+    public int Duration { get; set; }
+    public List<CreateUserGroupDto>? UserGroups { get; set; }
+}

BeReadyBackend/DTO/Groups/CreateUserGroupDto.cs

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+namespace BeReadyBackend.DTO.Groups;
+
+public class CreateUserGroupDto
+{
+    public int UserId { get; set; }
+}

BeReadyBackend/DTO/Groups/GetUserGroupDto.cs

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+namespace BeReadyBackend.DTO.Groups;
+
+public class GetUserGroupDto
+{
+    public int Id { get; set; }
+    public string? Username { get; set; }
+    public string? Grade { get; set; }
+    public int Score { get; set; }
+}