Add MAIL_FROM_ADDRESS and MAIL_FROM_NAME to env

.env.example

@@ -32,6 +32,8 @@ MAIL_PORT=2525
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
+MAIL_FROM_ADDRESS="pixelfed@example.com
+MAIL_FROM_NAME="Pixelfed"
 
 SESSION_DOMAIN="${APP_DOMAIN}"
 SESSION_SECURE_COOKIE=true