ReadMe.Md to include wifi syntax

[MattN-HB]

Is your feature request related to a problem? Please describe.
Recommend updating your ReadMe.MD with am example to generate your guest wifi password.

Describe the solution you'd like
In the "content" field add if you want display guest wifi:

WIFI:T:WPA2;S:MyNetworkName;P:ThisIsMyPassword;H:true;

Describe alternatives you've considered
Ultimately, in long run the user will want store secret in a secrets manager like hashi vault or at minimum base64 or call it from CSP secret . However, for home network and lockdown Home assistant little risk.