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/uniqe_count/README.md

@@ -0,0 +1,9 @@
+# Unique Count
+
+## Objectives
+
+In this directory you have a file with list of IP addresses called `ip_list`. Using the file, determine which IP address is the most recurring (listed the most times).
+
+# Solution
+
+Click [here](solution.md) to view the solution