Add link to development section to readme

[FrancescMartiEscofetQC]

Suggested in #30. Moved it as people usually look for the development instructions on the README and not on the docs which can be hard to find.

Checklist

• Added a CHANGELOG.rst entry

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.01%. Comparing base (60745dc) to head (306202a).
Report is 44 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
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  Coverage   95.01%   95.01%           
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  Files          14       14           
  Lines        1365     1365           
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  Hits         1297     1297           
  Misses         68       68           

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[kklein]

I can totally see your point from a GitHub perspective. Yet, README.md is also used for PyPI:

https://pypi.org/project/metalearners/

Hence, any development instructions would face in the overview of the package on PyPI -- where people are probably not looking to contribute or develop.

Could it be a good compromise to keep the development instructions in the docs and explicitly link to them in README.md?

[FrancescMartiEscofetQC]

Yet, README.md is also used for PyPI:

I completely forgot about this.

I changed to only the link.

[kklein]

Thank you :)