feat(catalog): add catalog metadata files

[jbeveland27]

Updates project with metadata to support new App Catalog commands

The NR1 CLI will soon be updated with commands for publishing to the app catalog. These metadata updates prepare this app for integrating with those new commands.

Changes

• Add a config.json file to a catalog directory in the repo root, matching this format.
• Move the /screenshots directory into catalog:
  • Update the screenshot file names (to match this format)
  • Update the screenshot links in the README.md.
• Add a documentation.md file to a catalog directory in the repo root, matching this format.
• (Optional) If there's additional documentation referenced in the repo, add a additionalInfo.md file to a catalog directory in the repo root, matching this format.
• Update the relative paths in documentation.md to be absolute paths
• Add the new header image to the top of README.md and catalog/documentation.md.
• Ensure the README.md commands section matches Justin's snippet.
• Run npm start and let the CLI move the nr1.json
  • Edit that file to make sure the name and description make sense.
• Add icon.png to the project root

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Closes newrelic/nr1-network-telemetry#31

[devfreddy]

:tada: This PR is included in version 0.4.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: