Make CoC and support channels more visible

https://help.github.com/articles/adding-a-code-of-conduct-to-your-project/
https://help.github.com/articles/adding-support-resources-to-your-project/

.github/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+HashiCorp Community Guidelines apply to you when interacting with the community here on GitHub and contributing code.
+
+Please read the full text at https://www.hashicorp.com/community-guidelines

.github/SUPPORT.md

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+# Support
+
+Terraform is a mature project with a growing community. There are active, dedicated people willing to help you through various mediums.
+
+Take a look at those mediums listed at https://www.terraform.io/community.html