VPN APP (V2ray+trojan+shadowsocksR) >> (windows/mac/linux "desktop" )

here is project for WINDOWS VERSION , read details; (this is part of project !)
smooth and fast VPN using protocols: V2ray-trojan-ssr vpn app with my own Ui & a basic backend panel using php+mysql
>> windows version = $900 <<
>> linux version = $900 <<
>> mac version = $900 <<

phase1-
you make app to connect to protocols , whitout ui
phase2-
if app connects to protocols , i give you ui and finalize project.
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main project is app for (ios + android + windows + mac + linux ) = each app version = $900 / whole project = $5000
depends on you wich one can you develop . (give us details)
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official programing language only ! not flutter-xcode-react,js...!

Microsoft studio = windows version
Android studio = android version
Swift = ios//mac version
C ,c++ = linux version

i provide: Ui + html template for panel + servers + openSource vpn protocols documentiation + API for authentication.
in text file described what exatly i need, please read it, important to followed by text file

main project link : https://www.freelancer.com/projects/mobile-phone/VPN-APP-ray-trojan-shadowsocksR-30615670/details