Add a receipt processing cookbook

[cpfiffer]

I added a receipt processing cookbook.

• Uses Qwen or Pixtral
• General purpose message templating, no messy model-specific token adding
• Easy function for compressing images down for lower processing/memory requirements

Should help illustrate a simple use case for vision models.

[rlouf]

Could you fix the merge conflict? Looks good otherwise.

[cpfiffer]

Yep, fixed!