Add a tutorial to deploy a simple "Hello Email" app on Heroku

use_cases/README.md

@@ -8,6 +8,7 @@ This directory provides examples for specific use cases of this library. Please
 
 * [How to Create a Django app, Deployed on Heroku, to Send Email with SendGrid](django.md)
 * [How to Deploy A Simple Hello Email App on AWS](aws.md)
+* [How to Deploy a simple Flask app, to send Email with SendGrid, on Heroku](flask_heroku.md)
 * [How to Setup a Domain Whitelabel](domain_whitelabel.md)
 * [How to View Email Statistics](email_stats.md)
 

use_cases/flask_heroku.md

@@ -0,0 +1,9 @@
+# Create a Flask app to send email with SendGrid
+
+This tutorial explains how to deploy a simple Flask app, to send an email using the SendGrid Python SDK, on Heroku.
+
+1. Create a SendGrid API key at https://app.sendgrid.com/settings/api_keys
+1. Go to https://github.com/swapagarwal/sendgrid-flask-heroku
+1. Click on `Deploy to Heroku` button, and follow the instructions.
+
+That's all. You'll be sending your first email within seconds!