Add MORE Terraform questions

Oh, this is only the beginning... :)
Seriously though, this change adds more questions about workspaces,
remote backends and in general, about Terraform state.

Author: abregman

README.md

@@ -2,7 +2,7 @@
 
 :information_source:  This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE
 
-:bar_chart:  There are currently **2523** exercises and questions
+:bar_chart:  There are currently **2538** exercises and questions
 
 :warning:  You can use these for preparing for an interview but most of the questions and exercises don't represent an actual interview. Please read [FAQ page](faq.md) for more details