Day 2: Add Zsh solution part 1

02/solution_1.zsh

@@ -0,0 +1,24 @@
+#!/usr/bin/zsh
+
+integer h=0
+integer v=0
+
+IFS="
+"
+for line in "${(@f)}"$(<input.txt)
+{
+    cmd=(${(s/ /)line})
+    case $cmd[1] in
+        down)
+            ((v += $cmd[2]))
+            ;;
+        up)
+            ((v -= $cmd[2]))
+            ;;
+        forward)
+            ((h += $cmd[2]))
+            ;;
+    esac
+}
+
+print Answer: $((h * v))