Simplifying README

[shwetaj2820]

https://github.com/mlcommons/ck/tree/master/cm-mlops/script/app-mlperf-inference-mlcommons-cpp#variation

In this README, the given script (which is run from the command line) is not quite user friendly and needs some modification or further explanation.

`cm run script --tags=app,mlcommons,mlperf,inference,cpp[,variations] [--input_flags]

cmr "app mlcommons mlperf inference cpp[ variations]" [--input_flags]`

[gfursin]

Thank you for your feedback @shwetaj2820 !

Agree! It was a while since we updated them. We plan to add a working solution with the --help flag first and then further explanations similar to

cm run script --tags=app,mlcommons,mlperf,inference,cpp --help

We will tell you when it's done!

[gfursin]

Done: 8b87981 . Will be available in master in the next PR. Thanks for your feedback again!