Update contribution document about how to use jfcm for local development

[bhanurp]

• [ ] All tests have passed. If this feature is not already covered by the tests, new tests have been added.
• [ ] The pull request is targeting the master branch.
• [ ] The code has been validated to compile successfully by running go vet ./....
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This PR updated contribution doc on how to use jfcm(jfrog cli manager) while contribution.

[github-actions[bot]]

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