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

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+# 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)

topics/terraform/exercises/terraform_local_provider/solution.md

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+# 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
+
+```sh
+# Create a directory
+mkdir my_first_run && cd my_first_run
+
+# Create the file 'main.tf'
+cat << EOT >>  main.tf
+resource "local_file" "mario_local_file" {
+    content  = "It's a me, Mario!"
+    filename = "/tmp/who_is_it.txt"
+}
+EOT
+
+# Run 'terraform init'
+terraform init
+# Running 'ls -la' you'll it created '.terraform' and '.terraform.lock.hcl'
+# In addition, it initialized (downloaded and installed) the relevant provider plugins. In this case, the "hashicorp/local"
+
+# Run 'terraform plan'
+terraform plan
+# It shows what Terraform is going to perform once you'll run 'terraform apply'
+
+<< terraform_plan_output
+Terraform will perform the following actions:
+
+  # local_file.mario_local_file will be created
+  + resource "local_file" "mario_local_file" {
+      + content              = "It's a me, Mario!"
+      + directory_permission = "0777"
+      + file_permission      = "0777"
+      + filename             = "/tmp/who_is_it.txt"
+      + id                   = (known after apply)
+    }
+
+Plan: 1 to add, 0 to change, 0 to destroy.
+terraform_plan_output
+
+# Apply main.tf (it's better to run without -auto-approve if you are new to Terraform)
+terraform apply -auto-approve
+
+ls /tmp/who_is_it.txt
+# /tmp/who_is_it.txt
+```