Moved repository interfaces to application layer, created blank visa requests handler

SchengenVisaApi/ApplicationLayer/VisaApplication/Services/VisaApplicationRequestsHandler.cs

@@ -0,0 +1,11 @@
+namespace ApplicationLayer.VisaApplication.Services
+{
+    /// Handles visa requests
+    public class VisaApplicationRequestsHandler()
+    {
+        public void HandleCreateRequest(CreateVisaApplicationRequest request)
+        {
+
+        }
+    }
+}