Add sales report scripts and results

sql/sales_report_results.txt

@@ -0,0 +1,40 @@
+# Task 1
+> source ./create_orders_view.sql
+> select * from OrdersView;
++---------+----------+--------+
+| OrderID | Quantity | Cost   |
++---------+----------+--------+
+| 1       | 9        | 82.50  |
+| 2       | 3        | 28.00  |
+| 3       | 3        | 31.00  |
+| 4       | 3        | 29.00  |
+| 6       | 15       | 150.50 |
++---------+----------+--------+
+
+# Task 2
+> source ./get_expensive_orders.sql
++------------+---------------+---------+--------+-----------------------+--------------------------+
+| CustomerID | FullName      | OrderID | Cost   | Mains                 | Starters                 |
++------------+---------------+---------+--------+-----------------------+--------------------------+
+| 3          | Li Wei Zhang  | 1       | 82.50  | Gigantes Plaki (2x)   | Grilled Artichokes (1x)  |
+|            |               |         |        | Pasta alla Norma (1x) | Lentil Soup (1x)         |
+|            |               |         |        |                       | Humus Plate (1x)         |
+| 5          | Ivanov Petrov | 6       | 150.50 | Minestrone (2x)       | Lentil Soup (2x)         |
+|            |               |         |        | Gigantes Plaki (2x)   | Eggplant Bruschetta (1x) |
+|            |               |         |        | Moussaka (1x)         | Humus Plate (1x)         |
+|            |               |         |        |                       | Grilled Artichokes (1x)  |
++------------+---------------+---------+--------+-----------------------+--------------------------+
+
+# Task 3
+> source ./get_popular_menu_items.sql
++--------------------+---------------+
+| Name               | OrderQuantity |
++--------------------+---------------+
+| Lentil Soup        | 4             |
+| Humus Plate        | 3             |
+| Gigantes Plaki     | 5             |
+| Minestrone         | 3             |
+| Fruit Salad        | 3             |
+| Grilled Mango      | 3             |
+| Grilled Waterlemon | 3             |
++--------------------+---------------+