Update README.md

[meryllblanchet]

Updated docs and added recommendation to use nvm to manage NodeJS installation and versions.

Description

Related Issue

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 change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #97   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          69     69           
  Branches       10     10           
=====================================
  Hits           69     69

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[duynguyen]

LGTM. Thanks @meryllblanchet !