Create example code that demonstrates sending an inline ICS which works fine inside Outlook

[thinkingserious]

Issue Summary

In reference to this comment.

[childish-sambino]

Generic JSON payload example: sendgrid/sendgrid-ruby#298 (comment)

[ptesar-xyndata]

@thinkingserious Thank you Thomas!

[ptesar-xyndata]

@thinkingserious any feedback on this? This issue is opened already for several years! And with many disappointed developers :(

[KasparLee]

I am also desperately in need of this, this is almost a dealbreaker to not have inline calendar events working in Outlook properly.

[ptesar-xyndata]

@KasparLee I'm already migrating to the mailgun. Should be leaving SendGrid by the end of the month :)