feat: Adds smtp configuration to example env.

example.env

@@ -1,2 +1,18 @@
 DOMAIN="https://vaultwarden.housh.dev"
 SIGNUPS_ALLOWED="true" # Deactivate after first account is created.
+
+# https://github.com/dani-garcia/vaultwarden/wiki/Enabling-Yubikey-OTP-authentication
+YUBICO_CLIENT_ID='<id>'
+YUBICO_SECRET_KEY='<secret>'
+
+# https://github.com/dani-garcia/vaultwarden/wiki/Enabling-admin-page
+ADMIN_TOKEN='<argon2 secret>'
+
+# https://github.com/dani-garcia/vaultwarden/wiki/SMTP-Configuration
+SMTP_HOST=smtp-mail.outlook.com
+SMTP_PORT=587
+SMTP_SECURITY=starttls
+SMTP_FROM=user@hotmail.tld
+SMTP_USERNAME=user@hotmail.tld
+SMTP_PASSWORD=MyPassw0rd
+SMTP_AUTH_MECHANISM="Login"