Add Doxygen comments to existing code

added 🍪 ToDo label

created merge request !11 (merged) to address this issue

mentioned in merge request !11 (merged)

mentioned in commit 3ae2723e

mentioned in commit 9978a703

mentioned in commit 25815054

mentioned in commit 89e2e385

mentioned in commit f4d065a0

added 🙏 Review label and removed 🍪 ToDo label

mentioned in commit 7464c842

closed with merge request !11 (merged)

mentioned in commit 6fed231d