Changed domains, configured links between VisaApplication and Applicant,created generic repository and repositories for domains

SchengenVisaApi/Infrastructure/Database/Applicants/Repositories/IApplicantsRepository.cs

@@ -0,0 +1,7 @@
+using Domains.ApplicantDomain;
+using Infrastructure.Database.Generic;
+
+namespace Infrastructure.Database.Applicants.Repositories
+{
+    public interface IApplicantsRepository : IGenericRepository<Applicant> { }
+}