feat(find-files): add subject, test and solution for new a exercise

sh/tests/find-files_test.sh

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+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
+
+challenge() {
+	submitted=$(cd "$1" && bash "$script_dirS"/student/find-files.sh)
+	expected=$(cd "$1" && bash "$script_dirS"/solutions/find-files.sh)
+
+	diff <(echo "$submitted") <(echo "$expected")
+}
+
+challenge find-files/folder1
+challenge find-files/folder2

sh/tests/solutions/find-files.sh

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+#!/bin/bash
+
+find . \( -name 'a*' -or -type f -name '*z' \)

subjects/find-files/README.md

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+## find-files
+
+### Instructions
+
+"start finding ..."
+
+Create a file `find-files.sh`, which will look for and show, in the current directory and its sub-folders:
+
+everything that starts with an `a` or,
+all the files ending with a `z` or,
+
+
+- You can use this for testing: https://assets.01-edu.org/devops-branch/find-files-example.zip
+
+- What to use : `find`
+
+- The output should be exactly like the example bellow but with the expected name
+
+```console
+$pwd
+<..>/find-files-example
+$./find-files.sh
+./folder2/zzzz
+./folder3/asd
+./folder3/sub-folder4/abc
+./folder3/sub-folder4/a_correct
+./folder3/sub-folder4/aefg
+./folder3/asd 2
+./folder3/ahmed
+./folder1/aolder_lol
+$
+```
+
+### Hints
+
+`find` command is used to search and locate the list of files and directories based on conditions you specify for files that match the arguments:
+
+```console
+$find ~/
+<all files and folders in the user home>
+$find ~/ \( -type f \)
+<all files in the user home>
+$
+```
+
+> You have to use Man or Google to know more about commands flags, in order to solve this exercice!
+> Google and Man will be your friends!