[Feature]: Box breathing

[sepandhaghighi]

Describe the feature you want to add

Add Box breathing technique.

This technique goes by other names, too:

1. 4×4 breathing
2. 4-4-4-4 breathing
3. Equal breathing
4. Four-square breathing
5. Square breathing

Describe your proposed solution

No response

Describe alternatives you've considered, if relevant

No response

Additional context

References:

1. https://health.clevelandclinic.org/box-breathing-benefits
2. https://www.medicalnewstoday.com/articles/321805#how-to-do-it