Suggested addition to the README

[gabrielcc2]

Hi,

While using HTAPBench right out of the box, we stumbled upon a very small thing that could be updated in the README:

For this line: COPY WAREHOUSE FROM '/dir/warehouse.csv' USING DELIMITERS ','; , perhaps it would be good to point out that instead this command is needed for orders: COPY OORDER FROM '/dir/order.csv' USING DELIMITERS ',' WITH NULL as 'null';

We also found the path to be dirorder.csv instead of /dir/order.csv.

I hope that this suggestion is useful to simply make the first try smoother for new users :)

Best,

Gabriel