doc: add document for various admission pickers #20
Description
There are various admission pickers for different cases, this chapter will introduce them.
- What is the admission picker?
- What does the admission picker do?
- How many admission pickers are provided in foyer default?
- How can users use them in different cases?
- How can users create a new admission pickers?
extra work
- Add version 0.13
- Enable version next
The chapter will be put in design section.