Use Markdown for README
package.json: Add start script
Use env for ports; Rename example.js -> tracker.js
README.md: Reveal future plans; Credit WizKid
Simplify folder structure lib/tracker -> lib
Clean up syntax (Remove trailing whitespace etc.)
Refactor Failure()
Refactor validateRequest()
package.json: Update main
package.json: Update description
README.md: Add WIP-notice