Updated readme

README.rst

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+|pytest| |documentation| |binder|
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 pyuff
 =====
 
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                 orddenom_spec_data_type=13)
 
 
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 |binder| to test the *pyuff Showcase.ipynb* online.
 
 .. |binder| image:: http://mybinder.org/badge.svg
    :target: http://mybinder.org:/repo/ladisk/pyuff
 .. |pytest| image:: https://github.com/ladisk/pyuff/actions/workflows/python-package.yml/badge.svg
     :target: https://github.com/ladisk/pyuff/actions
+.. |documentation| image:: https://readthedocs.org/projects/pyuff/badge/?version=latest
+    :target: https://pyuff.readthedocs.io/en/latest/?badge=latest
+    :alt: Documentation Status