Add rule to check for NOTICE file

[trevmex]

Issue Report

Add a rule to check for a NOTICE file.
See https://github.com/Comcast/petasos/blob/master/NOTICE for an example.

Expected Behavior

There is a rule to check for the NOTICE file.

Actual Behavior

There is no rule for this right now.

Steps to Reproduce the Issue

N/A

[cdelahousse]

This already exists for Apache licenses, which seems to be the only case we'd want it.
https://github.com/todogroup/repolinter/blob/master/rulesets/default.json#L48-L49
https://github.com/todogroup/repolinter/blob/master/rules/apache-notice.json

[annania]

I think this can close, if users want it for all projects, they can edit the repolinter.json file and move the notice check to the all section.

[trevmex]

Closing, then. Thanks for the input!