feat(comparator): add subject, test and solution for the exercise

sh/tests/comparator_test.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
+
+challenge() {
+    submitted=$(bash "$script_dirS"/student/comparator.sh $1 $2)
+    expected=$(bash "$script_dirS"/solutions/comparator.sh $1 $2)
+    diff <(echo "$submitted") <(echo "$expected")
+}
+for i in $(seq 1 10); do
+    n1=$(shuf -i 1-20 -n 1)
+    n2=$(shuf -i 1-30 -n 1)
+    challenge $n1 $n2
+done
+
+challenge "0" "0"
+challenge "10" "10"
+challenge "-11" "-11"

sh/tests/solutions/comparator.sh

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+#!/usr/bin/env bash
+
+if [ "$1" -gt "$2" ]; then
+    echo "$1 > $2"
+elif [ "$1" -lt "$2" ]; then
+    echo "$1 < $2"
+else
+    echo "$1 = $2"
+fi

subjects/devops/comparator/README.md

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+## comparator
+
+### Instructions
+
+Create a script `comparator.sh` which will verify if the first given argument is bigger, smaller or equal than the second given argument.
+You must print te output like the example in usage.
+
+### Usage
+
+```console
+$ ./comparator.sh 6 14
+6 < 14
+$ ./comparator.sh 29 3
+29 > 3
+$ ./comparator.sh 12 12
+12 = 12
+$
+```
+
+> You have to use Man or Google to know more about commands flags, in order to solve this exercise!
+> Google and Man will be your friends!