Changed models, added Application layer models

SchengenVisaApi/Infrastructure/Database/IUnitOfWork.cs

@@ -1,9 +1,8 @@
-namespace Infrastructure.Database
+namespace Infrastructure.Database;
+
+public interface IUnitOfWork
 {
-    public interface IUnitOfWork
-    {
-        /// Saves changes in data storage
-        /// <param name="cancellationToken">Cancellation Token</param>
-        Task SaveAsync(CancellationToken cancellationToken);
-    }
-}
+    /// Saves changes in data storage
+    /// <param name="cancellationToken">Cancellation Token</param>
+    Task SaveAsync(CancellationToken cancellationToken);
+}