feat(array-selector): add solution

sh/tests/solutions/array-selector.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash 
+
+IFS='
+'
+
+COLORS=('red' 'blue' 'green' 'white' 'black')
+if [[ ! $1 =~ ^[0-9]+$ ]] || [[ $1 -le 0 ]] || [[ $1 -gt ${#COLORS[@]} ]]; then
+    echo 'Error'
+    exit 1
+fi
+
+POS=$(($1 - 1))
+echo ${COLORS[$POS]}
+