Update Terraform.gitignore

Terraform.gitignore

@@ -4,3 +4,9 @@
 # .tfstate files
 *.tfstate
 *.tfstate.*
+
+# Ignore any .tfvars files that are generated automatically for each Terraform run. Most
+# .tfvars files are managed as part of configuration and so should be included in
+# version control.
+#
+# example.tfvars