Provide an inviting README.md

[deccer]

The current README is empty and doesn't explain anything for people who stumble upon this project. Let's come up with some text and possibly a bit of pics which explain this project in a few inviting words :)

[deccer]

Including some Getting-Started i suppse, we also miss that in the actual docs as well

We have some information in CONTRIBUTING

[deccer]

Describe a few goals we want to achieve with this thing, what we will be talking about roughly and what the future plans are

[deccer]

README should also show our GP mascot "froge" from the Model Loading tutorial