How to add a pretrained CSP model on mattergen github

[cypherumang65]

@danielzuegner I was testing with the CSP feature of Mattergen. However, I noticed that there was no previosuly available existing pretrained model in the mattergen github. So for testing purpose I trained one on the alex-mp-20 and its working fine for CSP. I want to add the pretrained model weights on the mattergen github for CSP. How can I do that?