Added validation and fixed errors

SchengenVisaApi/ApplicationLayer/Services/Applicants/Models/PlaceOfWorkModel.cs

@@ -0,0 +1,16 @@
+using Domains.ApplicantDomain;
+
+namespace ApplicationLayer.Services.Applicants.Models
+{
+    public class PlaceOfWorkModel
+    {
+        /// Name of hirer
+        public string Name { get; set; } = null!;
+
+        /// Address of hirer
+        public Address Address { get; set; } = null!;
+
+        /// Phone number of hirer
+        public string PhoneNum { get; set; } = null!;
+    }
+}