Created more proper NotFound exceptions

SchengenVisaApi/Infrastructure/Database/Locations/Repositories/Cities/Exceptions/CityNotFoundByNameException.cs

@@ -0,0 +1,11 @@
+using Domains.LocationDomain;
+using Infrastructure.Database.GeneralExceptions;
+
+namespace Infrastructure.Database.Locations.Repositories.Cities.Exceptions
+{
+    /// Exception to throw when city cannot be found by its name and its country name
+    /// <param name="name">Name of the city</param>
+    /// <param name="countryName">name of the city's country</param>
+    public class CityNotFoundByNameException(string name, string countryName)
+        : EntityNotFoundException<City>($"{name} with country {countryName} not found.");
+}