[metrics-bugs] #24112 [Metrics/ExoneraTor]: Update ExoneraTor's README file

[Tor Bug Tracker & Wiki]

#24112: Update ExoneraTor's README file
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     Reporter:  iwakeh              |      Owner:  metrics-team
         Type:  enhancement         |     Status:  new
     Priority:  Medium              |  Milestone:
    Component:  Metrics/ExoneraTor  |    Version:
     Severity:  Normal              |   Keywords:
Actual Points:                      |  Parent ID:
       Points:                      |   Reviewer:
      Sponsor:                      |
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 This update should be based on #21145 or even wait until ExoneraTor runs
 an embedded Jetty.  Also consider #23549 and #16597.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24112>
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