Add Terraform and Linux questions and exercises

Also updated the script that counts questions to actually update
the number in README.md

topics/linux/exercises/copy/README.md

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+# Copy Time
+
+## Objectives
+
+1. Create an empty file called `x` in `/tmp`
+2. Copy the `x` file you created to your home directory
+3. Create a copy of `x` file called `y`
+4. Create a directory called `files` and move `x` and `y` there
+5. Copy the directory "files" and name the copy `copy_of_files`
+6. Rename `copy_of_files` directory to `files2`
+7. Remove `files` and `files2` directories
+
+## Solution
+
+Click [here](solution.md) to view the solution.

topics/linux/exercises/copy/solution.md

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+# Copy Time
+
+## Objectives
+
+1. Create an empty file called `x` in `/tmp`
+2. Copy the `x` file you created to your home directory
+3. Create a copy of `x` file called `y`
+4. Create a directory called `files` and move `x` and `y` there
+5. Copy the directory "files" and name the copy `copy_of_files`
+6. Rename `copy_of_files` directory to `files2`
+7. Remove `files` and `files2` directories
+
+## Solution
+
+```
+touch /tmp/x
+cp x ~/
+cp x y
+mkdir files
+cp x files
+cp y files
+cp -r files copy_of_files
+mv copy_of_files files2
+rm -rf files files2
+```