Adding Sidekick app

[steveostudios]

Adding Sidekick which can be found at https://sidekick.tv.

[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of 28c9df6. Here's the output:

npm test

> electron-apps@1.7406.0 test /home/travis/build/electron/apps
> mocha --reporter min test/human-data.js test/colors-spec.js && standard --fix


  14485 passing (3s)
  1 failing

  1) human-submitted app data
       sidekick
         icon
           is between 256px x 256px and 1024px x 1024px:
     AssertionError: expected 144 to be within 256..1024
      at Context.<anonymous> (test/human-data.js:151:42)

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

---

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[ckerr]

Please fix the icon size to make CI happy 🔧

[Sanjit1]

Fix the CI error, and fix icon size

[vhashimotoo]

ping @steveostudios

[vhashimotoo]

Closing due to inactivity. Please open new PR if to add your application.