Update root readme

Author: RulerOf

README.md

@@ -1,6 +1,12 @@
-# terraform-code-examples
-Solving weird problems with Terraform
+# Andrew's Terraform Code Examples
 
+Documenting solutions to interesting Terraform problems.
+
+## Requirements
+
+Consider installing [tfenv](https://github.com/tfutils/tfenv) if you want these code exmaples to "just work" for you.
+
+# Examples
 
 * [Dynamic Templatefile Rendering](./dynamic-template-output/README.md)
   * Keeping `templatefile()` function calls and the files themselves DRY — avoids writing variables twice, as input and output.