Added Terraform Security Guide (#205)

README.md

@@ -87,6 +87,7 @@ Terraform enables you to safely and predictably create, change, and improve prod
 - [A Comprehensive Guide to Terraform](https://blog.gruntwork.io/a-comprehensive-guide-to-terraform-b3d32832baca#.w9x897ywp) - Series of blog posts from the author of "Terraform: Up & Running" that guide the reader from beginning with Terraform to using it in the real world.
 - [Using Terraform for Cloud Deployments - Part 1](https://dev.to/koenighotze/using-terraform-for-cloud-deployments---part-1) - Provisioning an EC2 instance.
 - [Hello, world: The Fargate/Terraform tutorial I wish I had](https://section411.com/2019/07/hello-world/) - Blog post describing setting up an ECS Fargate cluster from scratch
+- [Terraform Security Guide](https://sysdig.com/blog/terraform-security-best-practices/) - Blog post describing security best practices when working with Terraform
 
 ### Writing Custom Providers