More info in Readme

[cdsap]

Hi, I know the doc is here https://malinskiy.github.io/marathon/ but I think the Readme should contains some subset of information about the main features of this awesome tool. When I try to show the repo some people complains about that.

[smugleafdev]

Really hoping the gradle configuration section is added. Currently it's empty. It doesn't appear that the gradle plugin can even be configured, as far as I can tell.

[frogfx]

How to configure this in android studio

[Malinskiy]

Hey @frogfx! you can check the configuration section in the docs for CLI (preferable) or gradle plugin distribution. If in doubt - look at the samples or reach out to us on slack (there is an invite link on the README.md page).

[Malinskiy]

Updated the main readme with a basic overview