[wp-trac] [WordPress Trac] #33043: Add contributing.md to git mirror

[WordPress Trac]

#33043: Add contributing.md to git mirror
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 Reporter:  AD7six            |       Owner:  desrosj
     Type:  enhancement       |      Status:  assigned
 Priority:  normal            |   Milestone:  5.7
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:  needs-refresh     |     Focuses:
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Comment (by noisysocks):

 Just noting that we do allow PRs against that repo now, so long as they're
 linked to a Trac ticket.

 Nonetheless we should add a README.md which informs folks of this :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/33043#comment:9>
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