At the moment Braindrop is still pretty early in its development, so I'm very unlikely to accept PRs unless they're for very trivial issues. It's not that I won't accept code from others, it's just that I'm still in the "let's see where this takes me" stage of development with the application.
However, I'm very happy to receive feedback, suggestions and bug reports.
The best place for feedback and suggestions is in discussions. If it seems like something that makes sense for Braindrop I'll turn it into an issue from there.
Be sure to have a look over the TODO isues before leaving a request, it might be I'm already planning on implementing whatever it is you're asking for.
Please report any bugs as an issue. When doing so, please provide as much detail as possible, include things like Braindrop version, operating system, some details of the environment, etc.