NO-JIRA: Update README with instructions for running monitoring-plugin

[zhuje]

NO-JIRA: Update README.md with instructions for running monitoring-plugin (which now uses make commands).

[openshift-ci-robot]

@zhuje: This pull request explicitly references no jira issue.

In response to this:

NO-JIRA: Update README.md with instructions for running monitoring-plugin (which now uses make commands).

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zhuje
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[openshift-ci]

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