Add .nvmrc and Development Environment Setup Instructions

[chrisjtang]

Description

This change adds an .nvmrc file and development environment setup instructions for future ease of development/contributions.

How Has This Been Tested?

Development environment works locally with the node version added to .nvmrc and with the provided instructions.

Screenshots (if appropriate):

n/a

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:

• My code follows the code style of this project.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• All new and existing tests passed.

[Hovspian]

lgtm