add note to install...sh how to check if swap is on?

[ozett]

i had problems with the coral dev-board (edge-tpu from google).
i followed an article on medium to install opencv on the board, but only with 1GB swap.
i got some weired errors and after i while i increased to 2gb and everthing was fine.
while doing this i hat to check if the swap was activated.
i found this page with 3 manual methods to check.

https://www.cyberciti.biz/faq/linux-add-a-swap-file-howto/

may you want to put some of the hints into your readme or finish-notice of the srcipt?
so one could check and proof that the swap was acitivated?

regards,t