Add visuals to README

[MSlootwegVIKTOR]

Is your feature request related to the way how to work with pyLife, i.e. the API.? If yes, please describe.
To make the README visually more appealing, consider adding visuals that could help.

Is your feature request about new functionality, new calculation model? If yes please describe
Not referred to functionality. The request could help with the presentation of the repository.

Describe the solution you'd like
A start would be to add the logo of pyLife:

And a GIF of the web-based application of VIKTOR (GIF can be requested)

Indicate if you or someone you know would volunteer to work on this
I volunteer to contribute.

Additional context
Add any other context or screenshots about the feature request here.

[johannes-mueller]

Thanks @MSlootwegVIKTOR for the hint. This has been on our agenda for a while. Probably it's time to tackle it now. Maybe we can collect some ideas of what these visuals could be.

Like for example

• a rainflow matrix
• a Wöhler curve with a load collective
• A FEM mesh with damage values
• ...