add challenge friend button in /play which outputs a modal containing self username field and target friend username field upon submission output classic /play buttons where the user chooses casual/rated, time control, and finally generates the URL. the process is not that hard as you can look at the code in Game.java and the helper modules directory. I'm giving this a good first issue. It's a wanted feature so any help is appreciated.
add challenge friend button in /play which outputs a modal containing self username field and target friend username field upon submission output classic /play buttons where the user chooses casual/rated, time control, and finally generates the URL. the process is not that hard as you can look at the code in Game.java and the helper modules directory. I'm giving this a good first issue. It's a wanted feature so any help is appreciated.