consider adding an example dir (for more pub points)

[pq]

Follow-up from #745

@isoos adds:

Any of these should do:

• example/README.md
• example/lints.dart
• example/example.dart
• or more

How about:

example/README.md

An example project that uses Dart recommended lints.

example/analysis_options.yaml

include: package:lints/recommended.yaml

example/pubspec.yaml

name: example
environment:
  sdk: '>=2.12.0 <3.0.0'

dev_dependencies:
   lints: ^1.0.0