Send email when adding participant

- create invite email template
- move email config
- implement sendEmail functionality

config/config.js

@@ -19,4 +19,9 @@ module.exports = {
 	smtpRequireTLS: true, // True to force use of StartTLS
 	smtpSecure: false, // False to force use of StartTLS
 	smtpPool: true, // Pool connections to server
+
+	// EMAIL
+	appURL: 'https://meetingplanner.com',
+	sender: 'no-reply@ruihildt.xyz',
+	signature: 'The Meeting Planner Team',
 };