Tutorial for initializing evaluating visualizing model

[PariaValizadeh]

Tutorial for Training in regard to issue (Tutorial: add Model training section #177)) as we decide to make 2 separate tutorial, this pr create a separate multiclass training roadmap for beginners.

Roadmap

• [x] import dataset
• [x] prepare Data
• [x] prepare trainer
• [x] prepare model
• [x] initialize model
• [x] eval model

[raphaelschwinger]

@PariaValizadeh What is this PR about? Can you update the description?

[lurauch]

@PariaValizadeh pls resolve merge conflicts here as well

[PariaValizadeh]

@PariaValizadeh What is this PR about? Can you update the description?

I wrote the explanation