[tor-bugs] #31161 [Applications/Tor Browser]: Document usage and setup of Android signing token

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#31161: Document usage and setup of Android signing token
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam201907
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We have documentation in ´tor-browser-spec` about setting up our Windows
 signing token and should do the same for the Android one.

 We could add the relevant instructions for using the whole setup on our
 actual signing machine in a separate commit within this ticket's scope.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31161>
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