docs: add an example for setting plugin option

[mikana0918]

issue

#15

about

Added a sample working example for setting plugin option(s) on nuxt.config.js.
...I also stuck to figure out how to pass options here😇
Let me suggest using 'markdown-it-link-attributes' for clarification here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d615e56) to head (fba59b5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines           11        11           
  Branches         1         1           
=========================================
  Hits            11        11           

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