date-wizard/.github/prompts/10-custom-activities.prompt.md

i want you to add a custom-activity (Sonstiges) with an appropriate icon. The custom activity always appears last in the list of activities. The custom activity should be available for selection in the booking process, and when selected, it should allow the user to enter a description of the activity. The entered description should be stored along with the booking information. The custom activity can not be paired with any other activity, and if selected, it should be the only activity in the booking. Custom activity don't need to be stored for later but included in the information mail and the created ics file