Add Cantina contest report

[jubeira]

Description

PDF from Cantina contest.

Type of change

• Bug fix
• New feature
• Breaking change
• Dependency changes
• Code refactor / cleanup
• Optimization: [ ] gas / [ ] bytecode
• Documentation or wording changes
• Other

Checklist:

• The diff is legible and has no extraneous changes
• N/A Complex code has been commented, including external interfaces
• N/A Tests have 100% code coverage
• The base branch is either main, or there's a description of how to merge

Issue Resolution

N/A

[jubeira]

Note: this is the draft. Will update with the final one before merging.

[EndymionJkb]

Looks good; I added to the readme, and used superscripts instead of "*", "**", in case we have more notes going forward.

Unless you think we don't need this in the readme?

[jubeira]

I think it's fine. Let's just approve and merge this one.

[joaobrunoah]

LGTM!