add a static website for the package

[IndrajeetPatil]

Adds a {pkgdown} website.

After the PR is merged, whoever can change the Settings to the following:

And then add the URL here:

If you wish to have a look at what the website looks like locally, just run the following the package root directory:

pkgdown::build_site()

[codecov-commenter]

Codecov Report

Merging #167 (abdbe84) into develop (2541724) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #167   +/-   ##
========================================
  Coverage    48.52%   48.52%           
========================================
  Files           55       55           
  Lines         2537     2537           
========================================
  Hits          1231     1231           
  Misses        1306     1306           

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