add: контракты групп расходов

back/Contracts/DTOs/SpendingGroupDto.cs

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+namespace Contracts.DTO;
+
+public class SpendingGroupDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public Guid UserId { get; set; }
+}

back/Contracts/Mappers/SpendingGroupMapper.cs

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+using Contracts.DTO;
+using Contracts.ViewModels;
+
+namespace Contracts.Mappers;
+
+public static class SpendingGroupMapper
+{
+    public static SpendingGroupViewModel ToView(this SpendingGroupDto spendingGroup) 
+        => new() 
+        { 
+            Id = spendingGroup.Id, 
+            Name = spendingGroup.Name
+        };
+}

back/Contracts/Repositories/ISpendingGroupRepo.cs

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+using Contracts.DTO;
+using Contracts.SearchModels;
+
+namespace Contracts.Repositories;
+
+public interface ISpendingGroupRepo
+{
+    Task<SpendingGroupDto?> Get(SpendingGroupSearch search);
+    Task<IEnumerable<SpendingGroupDto>> GetList(SpendingGroupSearch? search = null);
+    Task<SpendingGroupDto> Create(SpendingGroupDto spendingGroup);
+    Task<SpendingGroupDto?> Delete(SpendingGroupSearch search);
+    Task<SpendingGroupDto?> Update(SpendingGroupDto spendingGroup);
+}

back/Contracts/SearchModels/SpendingGroupSearch.cs

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+namespace Contracts.SearchModels;
+
+public class SpendingGroupSearch
+{
+    public Guid? Id { get; set; }
+    public string? Name { get; set; }
+}

back/Contracts/Services/ISpendingGroupService.cs

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+using Contracts.DTO;
+using Contracts.SearchModels;
+using Contracts.ViewModels;
+
+namespace Contracts.Services;
+
+public interface ISpendingGroupService
+{
+    Task<SpendingGroupViewModel> GetDetails(SpendingGroupSearch search);
+    Task<IEnumerable<SpendingGroupViewModel>> GetList(SpendingGroupSearch search);
+    Task<SpendingGroupViewModel> Create(SpendingGroupDto model);
+    Task<SpendingGroupViewModel> Update(SpendingGroupDto model);
+    Task<SpendingGroupViewModel> Delete(SpendingGroupSearch search);
+}

back/Contracts/ViewModels/SpendingGroupViewModel.cs

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+namespace Contracts.ViewModels;
+
+public class SpendingGroupViewModel
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+}