Add sales report scripts and results

sql/get_popular_menu_items.sql

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+-- sales report - task 3
+-- changes:
+--   replaced menu name with menu item name, because I assumed that Little lemon wants orders à la carte
+--   instead of fixed menus
+select
+    MI.Name,
+    count(OI.OrderItemID) as OrderQuantity
+from MenuItems as MI
+inner join OrderItems as OI on MI.MenuItemID = OI.MenuItemID
+group by OI.MenuItemID
+having OrderQuantity > 2;