password improvement suggestion

[thiswillbeyourgithub]

Hi !

I'd like to suggest the ability to use a pin code instead of a password to restrict access to the notes, with the buttons appearing in random order to avoid "over-the-shoulder" hacking. It's faster than passwords and not really less safe (given that the pass is not used to encrypt the notes, yet ?). But most importantly it can be used with only one hand and even the less dominant, which is super handy when talking about a note taking app ;)

~~Also the ability to restrict access on a per note basis when only some of the notes need to be private.~~ (edit : Just noticed it existed, it seems to me that it is not obvious that "locking" means "restrict access" and not just "forbid changes" ;) )

And finally, the option to ask for unlocking only after some number of minutes have elapsed.

Thanks for reading this :)