feat: add documentation comments

src/WorkFlow.Application/Contracts/Repositories/IProfileRepository.cs

@@ -2,7 +2,20 @@
 
 namespace WorkFlow.Application.Contracts.Repositories;
 
+/// <summary>
+/// Repository implementation for retrieving <see cref="Profile"/> entities from the database.
+/// </summary>
 public interface IProfileRepository
 {
+    /// <summary>
+    /// Retrieves the <see cref="Profile"/> associated with a given user ID by calling a database function.
+    /// </summary>
+    /// <param name="userId">The unique identifier of the user whose profile is to be retrieved.</param>
+    /// <returns>
+    /// A task that represents the asynchronous operation. The task result contains the <see cref="Profile"/> object if found; otherwise, <c>null</c>.
+    /// </returns>
+    /// <remarks>
+    /// Logs an error if no profile is found, or if multiple profiles are returned, indicating potential data issues.
+    /// </remarks>
     Task<Profile?> ReadAsync(int userId);
 }