Fix CRAN checklist issues

[jamesmbaazam]

This PR addresses individual issues raised by the CRAN pre-release checklist provided in #80. Here is a commit by commit list of fixes:

• d312b98 fixes Citation file: change old-style citEntry() to bibentry()  #86.
• aef5172 fixes Add copyright holder  #91
• 0cc8099 fixes Update README with aspirational install instructions #90
• 1c1781f fixes Fix MIT license link #92

[codecov-commenter]

Codecov Report

Merging #89 (0fb6623) into main (0fe8a62) will not change coverage.
The diff coverage is n/a.

❗ Current head 0fb6623 differs from pull request most recent head 30c963f. Consider uploading reports for the commit 30c963f to get more accurate results

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files           5        5           
  Lines         240      240           
=======================================
  Hits          231      231           
  Misses          9        9           

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