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

SchengenVisaApi/Infrastructure/Database/Generic/IGenericReader.cs

@@ -0,0 +1,11 @@
+using Domains;
+
+namespace Infrastructure.Database.Generic
+{
+    public interface IGenericReader
+    {
+        /// Get all entities of type <typeparamref name="T"/> stored in storage
+        /// <typeparam name="T">Entity type to seek in storage</typeparam>
+        IQueryable<T> GetAll<T>() where T : class, IEntity;
+    }
+}