Add a couple of questions

exercises/shell/argument_check.md

@@ -0,0 +1,23 @@
+## Argument Check
+
+### Objectives
+
+Note: assume the script is executed with an argument
+
+1. Write a script that will check if a given argument is the string "pizza"
+ 1. If it's the string "pizza" print "with pineapple?"
+ 2. If it's not the string "pizza" print "I want pizza!"
+
+### Solution
+
+```
+/usr/bin/env bash
+
+arg_value=${1:-default}
+
+if [ $arg_value = "pizza" ]; then
+    echo "with pineapple?"
+else
+    echo "I want pizza!"
+fi
+```