feat(hard-perms): add subject, test and solution for the exercise

sh/tests/hard-perm_test.sh

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

sh/tests/solutions/hard-perm.sh

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+chmod 401 hard-perm/0 hard-perm/A && chmod 402 hard-perm/1 hard-perm/9 && chmod 604 hard-perm/2 hard-perm/8 && chmod 777 hard-perm/3 && chmod 510 hard-perm/4 hard-perm/7 && chmod 460 hard-perm/5 hard-perm/6

subjects/devops/hard-perm/README.md

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+## hard-perm
+
+### Instructions
+
+Create a file `hard-perm.sh`, which will change the default permissions for the files and folders inside the folder `hard-perms`, to the ones bellow:
+
+Right now the folder looks like this:
+
+```console
+$ ls -l hard-perm
+total 12
+drwxrwxr-x 2 user user 4096 dez 13 18:10 0
+-rw-rw-r-- 1 user user    0 dez 13 18:11 1
+-rw-rw-r-- 1 user user    0 dez 13 18:11 2
+drwxrwxr-x 2 user user 4096 dez 13 18:10 3
+-rw-rw-r-- 1 user user    0 dez 13 18:11 4
+-rw-rw-r-- 1 user user    0 dez 13 18:11 5
+-rw-rw-r-- 1 user user    0 dez 13 18:11 6
+-rw-rw-r-- 1 user user    0 dez 13 18:11 7
+-rw-rw-r-- 1 user user    0 dez 13 18:11 8
+-rw-rw-r-- 1 user user    0 dez 13 18:11 9
+drwxrwxr-x 2 user user 4096 dez 13 18:10 A
+
+```
+
+Expected output:
+
+```console
+$ ls -l hard-perm
+total 12
+dr-------x 2 user user 4096 dez 13 17:50 0
+-r------w- 1 user user    0 dez 13 17:51 1
+-rw----r-- 1 user user    0 dez 13 17:51 2
+drwxrwxrwx 2 user user 4096 dez 13 17:51 3
+-r-x--x--- 1 user user    0 dez 13 17:51 4
+-r--rw---- 1 user user    0 dez 13 17:51 5
+-r--rw---- 1 user user    0 dez 13 17:51 6
+-r-x--x--- 1 user user    0 dez 13 17:51 7
+-rw----r-- 1 user user    0 dez 13 17:51 8
+-r------w- 1 user user    0 dez 13 17:51 9
+dr-------x 2 user user 4096 dez 13 17:50 A
+```
+
+### Hints
+
+> 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!
+
+### References
+
+- [Chmod](https://www.linode.com/docs/guides/modify-file-permissions-with-chmod/#modify-file-permissions-with-chmod)