It's a brainstorming-technique, which allows to create many ideas within a relatively short period of time.
You can read more about it here.
Usually, you would just write down your ideas on paper and pass it around, so that everybody can contribute with their ideas. This comes with the downside, that some people cannot write readable and that your group has to be physically at the same place.
Our project aims to solve those problems, by not allowing the user to write with his hands and by providing a web-application your team does not necessarily have to be physically at one place.
You can read more about everything in the Wiki on Github.
But basically you can build and deploy the project yourself by following our Setup Guide, which covers the option to deploy everything automatically for you using docker or everything manually.