permissions required for stalwart account

[Noneangel]

Hi,

Thanks for this project.

Could you add this in the README:

The permissions needed for the stalwart account are:

• authenticate (Authenticate)
• individual-update (Modify user account information)

To set those permissions, create / modify an account:

1. Go to https://<stalwart url>/manage/directory/accounts
2. Edit account (or create account)
   
3. Go to permission tab, then select the correct permissions.
   To select only the correct permission, you can inject this script in the navigator console:

   for (i of $$('[type="radio"][id$="off"]')) i.click();
   $('#authenticate-on').click();
   $('#individual-update-on').click();

4. Press Save changes button at the bottom of the page.