bug#41890: 28.0.50; [PATCH]: Add bindings for project.el

[Juri Linkov]

>> Do you want to remove this intuitive binding 's' from 'shell' command
>> because you want to use 's' for some other command?
>
> Maybe project-isearch? I recall you wanted that one day.

project-isearch should use 'C-x p C-s' like it's used in e.g.

  M-s a C-s       dired-do-isearch
  M-s a C-s       vc-dir-isearch

> If not, I'm fine with keeping project-shell on 's' for now.
>
> But if reach the shortage of characters on this keymap someday, and some
> unbound command would really fit that letter, I'd rather not dedicate 
> two different characters to shell-like functionality.

I don't insist on 's' for shell.  Maybe 's' is more suitable for 
'project-search'.