Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/terraform/exercises/terraform_local_provider/exercise.md

@@ -0,0 +1,22 @@
+# Local Provider
+
+## Objectives
+
+Learn how to use and run Terraform basic commands
+
+1. Create a directory called "my_first_run"
+2. Inside the directory create a file called "main.tf" with the following content
+
+```terraform
+resource "local_file" "mario_local_file" {
+    content  = "It's a me, Mario!"
+    filename = "/tmp/who_is_it.txt"
+}
+```
+3. Run `terraform init`. What did it do?
+4. Run `terraform plan`. What Terraform is going to perform?
+5. Finally, run 'terraform apply' and verify the file was created
+
+## Solution
+
+Click [here to view the solution](solution.md)