docs: how to install private packages

[ghost]

Description

This PR explains how to install private packages.

Motivation and Context

How has this been tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] Add tests to cover changes as needed.
• [x] Update documentation as needed.

[codecov-commenter]

Codecov Report

Merging #375 (e372c3b) into dev (aacd914) will not change coverage. The diff coverage is n/a.

:exclamation: Current head e372c3b differs from pull request most recent head 278cd94. Consider uploading reports for the commit 278cd94 to get more accurate results

@@           Coverage Diff           @@
##              dev     #375   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          44       44           
  Lines        1804     1804           
  Branches      329      329           
=======================================
  Hits         1461     1461           
  Misses        342      342           
  Partials        1        1           

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