Add readthedocs config

[ods]

Changes

An attempt to fix Read the Docs builds. Right now builds fail, complaining about missing config file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.94%. Comparing base (2f976d0) to head (da31066).

❗ There is a different number of reports uploaded between BASE (2f976d0) and HEAD (da31066). Click for more details.

HEAD has 236 uploads less than BASE

Flag	BASE (2f976d0)	HEAD (da31066)
unit	60	34
cext	77	16
purepy	75	18
integration	92	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1034       +/-   ##
===========================================
- Coverage   95.02%   52.94%   -42.09%     
===========================================
  Files         114      114               
  Lines       16970    16970               
  Branches     2771     2771               
===========================================
- Hits        16125     8984     -7141     
- Misses        497     7677     +7180     
+ Partials      348      309       -39     

Flag	Coverage Δ
cext	50.11% <ø> (-41.83%)	⬇️
integration	?
purepy	52.66% <ø> (-41.83%)	⬇️
unit	52.87% <ø> (-0.01%)	⬇️

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