Added rst file for rdt of distributed module

[GFleishman]

Happy to make any changes you like. Added the new file to the index, of course any name or position in the list is fine with me. Here are screenshots of appearance:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.69%. Comparing base (4f2229d) to head (ded9f7e).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1107      +/-   ##
==========================================
- Coverage   52.69%   52.69%   -0.01%     
==========================================
  Files          18       18              
  Lines        4338     4342       +4     
==========================================
+ Hits         2286     2288       +2     
- Misses       2052     2054       +2     

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[carsen-stringer]

this looks amazing thank you!!