first commit

Interfaces/IDocumentRepository.cs

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+using Fitness_core_BE.Models;
+
+namespace Fitness_core_BE.Interfaces
+{
+    public interface IDocumentRepository
+    {
+        Task<UserDocument> UploadDocumentAsync(UserDocument userDocument);
+        Task<string> GetLastSequnce();
+        Task<List<UserDocument>> GetDocumentsByUserId(Guid userId);
+        Task<UserDocument?> GetDocumentById(int documentId);
+        Task<bool> RemoveDocument(int documentId);
+    }
+}