feat: upgrade project metadata for catalog

[danielgolden]

Upgrade the project meta data to support new catalog commands

The NR1 CLI will soon be updated with commands that enable one to request to have their app added to the catalog. In order to prepare the existing open source NR1 apps for that coming change I've added meta data according to what the catalog commands will be looking for.

• 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.

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Resolves newrelic#25

[devfreddy]

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

The release is available on GitHub release

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