Document how this compares to https://github.com/aspect-build/rules_py/blob/v1.6.5/docs/pex.md

[hofbi]

https://github.com/aspect-build/rules_py/blob/v1.6.5/docs/pex.md also provides a pex py_binary. Would be helpful people landing here to know how this compares to what rules_py offers.

[UebelAndre]

I can write up a comparison at some point but primarily it offers scie support which allows you to build executable files and run them without a python interpreter being installed on the target environment.