Document installing stress from pip

[m-czernek]

I noticed that stress can be installed via pip. I think it's useful information, so I wanted to put it into the readme.

WDYT?

[amanusk]

Thanks for the interest and the pull request. I agree that it would be better to incorporate a stress test into s-tui and not rely on an external stress utility to implement this functionality.

The version of stress installable from pip is this: https://github.com/mattixtech/stress.git It appears to be a simple process running a white true loop, so not related to the original stress or stress-ng and doesn't perform quite the same thing. The plus side is that it only depends on pstuil which is already a dependency. Perhaps something simple like this should be considered, and have several options of stressing to choose from.

Would you be interested in working on baking a stress functionality into s-tui?