add installation instructions from romancal

[zacharyburnett]

Related to RCAL-613

Checklist

• Schema changes discussed at RAD Review Board meeting
• Added entry in CHANGES.rst under the corresponding subsection
• Updated relevant roman_datamodels utilities and tests
• Passed romancal regression testing on Jenkins / PLWishMaster. Link: https://plwishmaster.stsci.edu:8081/job/RT/job/romancal/XXX/

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c46d5a1) 95.32% compared to head (0bf0069) 95.32%.
Report is 1 commits behind head on main.

❗ Current head 0bf0069 differs from pull request most recent head 01179b7. Consider uploading reports for the commit 01179b7 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #298   +/-   ##
=======================================
  Coverage   95.32%   95.32%           
=======================================
  Files           4        4           
  Lines         171      171           
=======================================
  Hits          163      163           
  Misses          8        8           

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