Add testing CLI changes guide to contributing.md

[Ashutosh-Bhadauriya]

Related to PR #214 and issue #210

Add the guide in CONTRIBUTING.md to test the CLI changes

[changeset-bot]

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Latest commit: 4552762

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[ericallam]

This looks good! Just one note that if you are highlighting code inline to just use a single backtick instead of a triple-backtick

[Ashutosh-Bhadauriya]

Just updated it and resolved merge conflicts

[ericallam]

Nice one, thanks for this!

/tip $25

[algora-pbc]

🎉🎈 @Ashutosh-Bhadauriya has been awarded $25! 🎈🎊