Please, keep it simple. That is its strength.
Is there a public donation address somewhere? You could make donation address visible also inside the app and on github.
@minimalB absolutely. I will not add anything to the app that I don't believe adds value for users. Right now I think the biggest barrier for new users is obtaining some bitcoin once they have the wallet, so that's why I'm interested in having a convenient option to do so that doesn't detract from the simplicity of the app. I will only add features to the app if they can be done in a simple, intuitive way that doesn't add UI clutter.
I'm not a huge fan of the whole donation thing. It's fine I guess, but something about the whole idea doesn't sit right. You wouldn't donate to google or apple even though they give away a lot of their services for free (search, gmail, safari, OS X)... they're not charitable ventures and neither is breadwallet.