[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3682: Add CONTRIBUTORS.md file to Docs

[Tahoe-LAFS]

#3682: Add CONTRIBUTORS.md file to Docs
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 Reporter:  maylee         |          Owner:
     Type:  task           |         Status:  new
 Priority:  minor          |      Milestone:  undecided
Component:  documentation  |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
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 Add a lightweight cheatsheet-style doc for contributors.

 Part of:

 * ticket:3585 -Update notes for contributors

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3682>
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