Add available bookings scripts and results

sql/check_booking.sql

@@ -0,0 +1,10 @@
+-- available bookings - task 2
+-- changes:
+--   changed BookingDate (Reserved) data type from date to datetime, because I assumed that Little Lemon
+--   allows wants bookings per day and table - a table is considered blocked for 2 hours
+-- noqa: disable=CP03,LT02,RF03
+create procedure CheckBooking (in Reserved datetime, in TableNumber int, out IsFree boolean) --
+begin
+    set IsFree = TableIsFree(Reserved, TableNumber);
+    select concat("Table ", TableNumber, " is ", if(IsFree, "free", "already booked")) as BookingStatus;
+end