Add TROUBLESHOOTING.md

[colto]

Adding TROUBLESHOOTING.md to the project and adding a snippet about viewing the request_body before sending to SG API.

#22

[SendGridDX]

All committers have signed the CLA.

[thinkingserious]

Hello @colto,

Thanks again for the PR!

We want to show our appreciation by sending you some swag. Could you please fill out this form so we can send it to you? Thanks!

Team SendGrid DX

[mbernier]

@colto
If you are interested, we would love the opportunity to talk to you about Hacktoberfest and our API libraries.

Our agenda would be: Explore what you liked and is there anything we can do to improve?

You can grab a time on my calendar that works for you and we can have a chat on Google Hangout or Skype. If you prefer, you can email me using my GitHub username at my company’s domain.

Thank you so much,

Matt Bernier - @mbernier - SendGrid Developer Experience Product Manager
Elmer Thomas - @thinkingserious - SendGrid Developer Experience Engineer
@sendgrid