Adding ‘Hello Electron’ to Boilerplate Section of Readme

[erictherobot]

By submitting this pull request, I promise I have read the contributing guidelines twice and ensured my submission follows it. I realize not doing so wastes the maintainers' time that they could have spent making the world better. 🖖

• I believe this should be included in the boilerplate section because
  it’s a helpful tool to kick off various projects using React +
  Electron. Or Tone.js + Electron… and others.
• Also, I’ve read the Contribution Guidelines twice.

[sindresorhus]

Some feedback:

• You're not really showing off much of Electron in there. 95% of it would apply to a web app too. And the actual Electron code is mostly just the default Electron skeleton. Use some more Electron APIs.
• Each branch readme needs a better explanation and docs of what it provides and its intent.
• The items in the Branches section should be linkable, so you can easily click into one of the branches.
• You're not doing users any favors by using electron-packager directly. I would strongly suggest using electron-builder instead, which requires less config and is much more comprehensive.
• babel-preset-es2016-node5, Electron is based on Node.js 6, so I would recommend the https://github.com/salakar/babel-preset-node6 preset instead (Less transpilation!).
• Why is this using a custom script? Seems like rm -rf would be enough.

[sindresorhus]

Closing for lack of response.