Create CONTRIBUTING.md

[jacobtomlinson]

Ref dask/community#17

[codecov]

Codecov Report

Merging #41 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #41   +/-   ##
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  Coverage      96%   96%           
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  Files           3     3           
  Lines          75    75           
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  Hits           72    72           
  Misses          3     3

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[andersy005]

Thank you for putting this together, @jacobtomlinson! Let me know if this is ready to be merged

[jacobtomlinson]

Should be good now.

It's just a little shim to point people to the main docs because folks look for a CONTRIBUTING.md file more commonly these days.

I sprayed similar PRs to this throughout the Dask org and quite a few have been merged already by various code owners.