[GitHub] drill issue #1220: DRILL-6328: Consolidate developer docs in docs folder.

[ilooner]

Github user ilooner commented on the issue:

    https://github.com/apache/drill/pull/1220
  
    @paul-rogers @arina-ielchiieva Please review. After this goes in I will add 
the additional testing docs I wrote to Paul's existing documentation.


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