create walkthrough for npm installation and example project creation

[brettfiedler]

Discussed with JO during meeting today:
Here's a rough sketch of needed tasks:

Getting started walkthrough for NPM package. Create new markdown file. This will ultimately replace scenery.md.
(whatever makes most sense here, but something like…)

• Installation + Initial Project Skeleton
• Add a few common components and bind them together
• E.g., Interaction changes another component. Animation happens.
• Add “easy” inclusive features (Pan & Zoom) and a sound (tambo usage).
• Add Alternative Input (tab order, etc)
• Add interactive highlights.
• Add screen reader support
• Tier 1 description
• Something more advanced (pull in Jesse if needed).
• Add Voicing
• Same basics as screen reader.

In support of broader issue #60