DOC: create tabular-data.ipynb

[raybellwaves]

Added a tabular-data.ipynb notebook to show how you can use xskillscore in regression problems with tabular (pandas.DataFrame) data

Related to #217

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Merging #330 (86e9c4d) into main (60f974c) will not change coverage.
The diff coverage is n/a.

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  Files          23       23           
  Lines        2627     2627           
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  Hits         2483     2483           
  Misses        144      144           

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[aaronspring]

Could you check whether the performance increase depends on the order of computation? Could you check once the pd version after the xr version?

[raybellwaves]

Could you check whether the performance increase depends on the order of computation? Could you check once the pd version after the xr version?

[aaronspring]

I didn't mean that. I meant rerunning the pd cell after the xs cell to check if performance increase comes from data in memory already. Probably not the case @raybellwaves