Add icon to a dropdown list

I have a dropdown list with countries, which also have a search box. The task for this project is add icon to each option in the list, which may be country flag or any other icon. Icon can be added at begining and/or end of the option text. Freelancer need to add only some icons and give me instruction on how to add for the remaining options in the list. I provide all the files I have. I prefer freelancer who can start working immediately and give me solution in few time.