Implemented groundwork for search configuration.

Props/Services/Modules/IShopManager.cs

@@ -0,0 +1,14 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Props.Models.Search;
+using Props.Shop.Framework;
+
+namespace Props.Services.Modules
+{
+    public interface IShopManager
+    {
+        public IEnumerable<string> AvailableShops();
+        public Task<IList<ProductListing>> Search(string query, SearchOutline searchOutline);
+    }
+}