Adding new fields to Conference Payment Doctype

[Mangeshrex]

The Conference Payment doctype needs a couple of more fields which are needed for enabling tshirt addons in all the City Conferences this year. This will help me to write Server Script to add a T-shirt amount to the users ticket.

The needed fields should be in the following way:

1. Custom Section
2. T-Shirt Addon field: with type Select options to be "Yes", "No"
3. T-Shirt Price field: with type Currency
4. T-Shirt Size field: with type Select and options to be "S, M, L, XL, XXL"

A ref example is given below:

P.S: I am not able to add these changes due to some issues with my mariadb installation.