Save my eyes

[snk4tr]

Is your feature request related to a problem? Please describe.
All files with metrics are named as their abbreviation except inception_score.py

Also rename Minimal examples in README.md

Describe the solution you'd like
Rename to isc.py or ins.py.

Additional context
It is not possible to name file is.py because then it will be impossible to import from it because is is a Python keyword.