Edit pass on README

[mmacy]

Purpose

• Fix YAML front matter so the sample lights up in the Docs Samples Browser.
• Copy edit for ease and clarity

Does this introduce a breaking change?

[ ] Yes
[ X ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ X ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

N/A

What to Check

Verify that the following are valid

• Sample runs.