Create README.rst from README.md

[stephanmg]

Addresses issue #647

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.94%. Comparing base (b9022f3) to head (71c47b3).

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #649      +/-   ##
===========================================
+ Coverage    80.93%   80.94%   +0.01%     
===========================================
  Files          141      141              
  Lines         8544     8544              
===========================================
+ Hits          6915     6916       +1     
+ Misses        1629     1628       -1     

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[stephanmg]

Might want to get rid of README.rst too, but that is required for deployment to PyPi (creates overview page)

[stephanmg]

README.rst should now be created automatically from the correctly rendering (in Github) file README.md