First you need to install sparrow tool:

$ cpanm Sparrow

Then you need to sign up on SparrowHub:

https://sparrowhub.org/sign_up

Then you need to login at SparrowHub:

https://sparrowhub.org/sign_in

And generate SparrowHub token:

https://sparrowhub.org/token

Setup sparrowhub.json file saveat your laptop:

$ cat ~/sparrowhub.json
{
  "user"  : "melezhik",
  "token" : "ADB4F4DC-9F3B-11E5-B394-D4E152C9AB83"
}

Develop a new plugin:

Follow Outthentic framework documentation on how to develop a sparrow plugins.

Upload plugin to SparrowHub:

$ sparrow plg upload