feat(product-manifest): extend generator-node:app

[gregswindle]

Description of change

Generate:

• .editorconfig
• .gitattributes
• .gitignore
• LICENSE
• package-lock.json
• package.json

Initialize a (local) Git repository, too, if one doesn't exist.

Associated issue(s)

Closes #4

• The acceptance criteria for all associated issues have been completed, tested, and validated.

PR check-list

✅ Please review and check the appropriate items.

1. Code standards compliance

• ESLint passes.

2. Code quality

• The quality gateways pass with an "A" grade.

Measure	Scores
Complexity
Duplications
Issues
Maintainability
Reliability
Security

3. Test coverage

• The source code is 100% covered with passing specs.

ℹ️ These tasks are not required to open a PR, and may be addresses while the PR is open.

[gregswindle]

Despite Appveyor's intransigents, I'm gonna merge in order to keep things moving along.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0e539d0). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #6   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      1           
  Lines             ?     30           
  Branches          ?      6           
=======================================
  Hits              ?     30           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
generators/app/index.js	100% <100%> (ø)

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