feat(skip-lines): add subject, test and solution for the exercise skip-line

sh/tests/skip-lines_test.sh

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+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+submitted=$(bash student/skip-lines.sh)
+expected=$(bash solutions/skip-lines.sh)
+
+diff <(echo "$submitted") <(echo "$expected")

sh/tests/solutions/skip-lines.sh

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+#!/usr/bin/env bash
+
+ls -l | sed -n 'n;p'

subjects/skip-lines/README.md

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+## Skip lines
+
+### Instructions
+
+Write a command line in a `skip-lines.sh` file that prints the result of a `ls -l` skipping 1 line out of 2, starting with the **first** one.
+
+Example:
+
+```console
+User-> ls -l
+drwxr-xr-x 16 User User      4096 nov 11 10:55 Desktop
+drwxr-xr-x 22 User User      4096 nov  4 10:02 Documents
+drwxr-xr-x  6 User User      4096 nov 11 10:40 Downloads
+drwxr-xr-x  2 User User      4096 mar 31  2022 Music
+drwxr-xr-x  2 User User      4096 set 29 10:34 Pictures
+drwxr-xr-x  2 User User      4096 nov 23  2021 Public
+```
+
+What we want your script to do is:
+
+```console
+drwxr-xr-x 16 User User      4096 nov 11 10:55 Desktop
+drwxr-xr-x  6 User User      4096 nov 11 10:40 Downloads
+drwxr-xr-x  2 User User      4096 set 29 10:34 Pictures
+```
+
+**Tips:**
+
+Here are some Commands that can help you:
+
+- `sed`. Edit text in a scriptable manner. You can see also: awk. [For more information](https://www.gnu.org/software/sed/manual/sed.html).
+
+  - Print just a first line to stdout:
+    `{{command}} | sed -n '1p'`
+
+```console
+User-> cat file
+AIX
+Solaris
+Unix
+Linux
+HPUX
+User-> sed -n '1p' file
+AIX
+```
+
+Use man to see how `awk` or `sed` works, they can do the job.