Add data dir explanation

[prakaa]

How's this @mdavis-xyz?

Closes #12

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.81%. Comparing base (bbcedc2) to head (aa44d4d).
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@@            Coverage Diff             @@
##           master      #16      +/-   ##
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- Coverage   81.98%   81.81%   -0.17%     
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  Files           2        2              
  Lines         161      165       +4     
  Branches       26       28       +2     
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+ Hits          132      135       +3     
- Misses         26       27       +1     
  Partials        3        3              

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[mdavis-xyz]

It's still not clear to me. DATA contains PREDISPATCH* and P5MIN* files. So if you want those files, how do you choose which folder to use?

[prakaa]

It's still not clear to me. DATA contains PREDISPATCH* and P5MIN* files. So if you want those files, how do you choose which folder to use?

Yeah fair. I initially thought users who might want to access this data would use NEMSEER so I didn't bother to explain. But I think it's worth including if these are options in this package (which I think they should be).

Hopefully what's there is clear enough now. Thanks for your feedback!