Add link to DuckDB documentation in the README

[szarnyasg]

No description provided.

[codecov-commenter]

Codecov Report

Merging #17 (87878cf) into main (b60a72d) will not change coverage.
The diff coverage is n/a.

❗ Current head 87878cf differs from pull request most recent head 74699af. Consider uploading reports for the commit 74699af to get more accurate results

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   85.62%   85.62%           
=======================================
  Files         106      106           
  Lines        3596     3596           
=======================================
  Hits         3079     3079           
  Misses        517      517           

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[krlmlr]

Thanks!