Add Joss citation badge

[jfy133]

openjournals/joss-reviews#5627 (comment)

[Midnighter]

Looks like there may have been a new pandera version that accidentally requires pyspark?

[jfy133]

🤷 I just played with markdown 😬

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6c2843b) 82.17% compared to head (574b4f7) 82.17%.

❗ Current head 574b4f7 differs from pull request most recent head 7db4c75. Consider uploading reports for the commit 7db4c75 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #125   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files         110      110           
  Lines        1677     1677           
  Branches      299      299           
=======================================
  Hits         1378     1378           
  Misses        255      255           
  Partials       44       44           

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[Midnighter]

Snuck in a commit to add a paragraph to the docs. Thanks!