docs: add instructions to get data from ERDDAP. Fixes (#147)

[salvafern]

Fix #147

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dd9b2b6) 85.99% compared to head (eb06110) 85.99%.

❗ Current head eb06110 differs from pull request most recent head 2e32545. Consider uploading reports for the commit 2e32545 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #152   +/-   ##
=======================================
  Coverage   85.99%   85.99%           
=======================================
  Files           9        9           
  Lines         307      307           
=======================================
  Hits          264      264           
  Misses         43       43           

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[maelle]

Thanks! Could you also mention (no need for an example) EMODnetWCS?

[salvafern]

Done :)

[maelle]

🚀 thank you!

[maelle]

why list it here? maybe rather in a special field à la Config/Needs see https://r-pkgs.org/description.html#sec-description-custom-fields?