Add codeclimate cli instructions. (#1043)
Add codeclimate cli instructions. (#1043)

* Add codeclimate cli instructions.

Add the instructions for the users that want to mess around with the codeclimate cli.
It is useful to test locally the config changes.

Reviewers:
* @mistercrunch 
* @ascott 
* @vera-liu

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

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