Add design principles vignette

[jamesmbaazam]

This PR closes #34 by adding a design vignette to the package website.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (5e6fd49) to head (5eed429).

❗ Current head 5eed429 differs from pull request most recent head 52e6642. Consider uploading reports for the commit 52e6642 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
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  Coverage   98.78%   98.78%           
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  Files           8        8           
  Lines         574      574           
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  Hits          567      567           
  Misses          7        7           

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[sbfnk]

This is great! Only some small suggestions.

As a general point for text-based files such as this one or .tex files I'm a big fan of the "one line per sentence" (rather than 80 character cutoff) format as it makes changes easier to apply/visualise in a diff-based interface such as the one used by github. But everyone has different preferences/editors etc. so I don't think there's a hard and fast rule.

[jamesmbaazam]

I'm a big fan of the "one line per sentence" (rather than 80 character cutoff) format as it makes changes easier to apply/visualise in a diff-based interface such as the one used by github. But everyone has different preferences/editors etc. so I don't think there's a hard and fast rule.

Thanks. It's a good point. I'll do that in the future and make sure R Studio wraps it (for me) to make it easier to work with.

[jamesmbaazam]

Merging this as it has already been reviewed.