update installation instructions

[dlandtaa]

Added explicit instructions to clone the repo before attempting installation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.88%. Comparing base (d03dd92) to head (80103a9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #157   +/-   ##
=======================================
  Coverage   90.88%   90.88%           
=======================================
  Files          92       92           
  Lines       10424    10424           
=======================================
  Hits         9474     9474           
  Misses        950      950           

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