[metrics-bugs] #25402 [Metrics/Website]: Add `contrib` section to CollecTor's file structure protocol

[Tor Bug Tracker & Wiki]

#25402: Add `contrib` section to CollecTor's file structure protocol
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:  #24229
       Points:                   |   Reviewer:
      Sponsor:                   |
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 [https://gitweb.torproject.org/collector.git/tree/src/main/resources/docs/PROTOCOL
 CollecTor's file structure protocol]

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25402>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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