// TODO:

// pdf reader copy past, night mode... features

// premiem feature (annual subscribtion) // siler - 100 etb (reader activity will be ad free) // gold - 150 etb - all ads will be removed

// note taking feature

// delete subject file

//send subject units

// reward user when invite others through phone // verify phone with yegara sms

// desktop app (through c# if possible)