feat(set-internal-vars): add subject, test and solution for the exercise

sh/tests/set-internal-vars_test.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# Unofficial Bash Strict Mode
+set -euo pipefail
+IFS='
+'
+
+submitted=$(bash student/set-internal-vars.sh)
+expected=$(bash solutions/set-internal-vars.sh)
+
+diff <(echo "$submitted") <(echo "$expected")

sh/tests/solutions/set-internal-vars.sh

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+MY_MESSAGE="Hello World"
+MY_NUM=100
+MY_PI=3.142
+MY_ARR=(one, two, three, four, five)
+echo $MY_MESSAGE
+echo $MY_NUM
+echo $MY_PI
+echo ${MY_ARR[*]}

subjects/devops/set-internal-vars/README.md

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+## set-internal-vars
+
+### Instructions
+
+Create a script `set-internal-vars.sh`, which will allow you to create and print the following variables.
+
+- `MY_MESSAGE` which contains the string `"Hello World"`.
+- `MY_NUM` which contains the number `100`.
+- `MY_PI` which contains the number `3.142`.
+- `MY_ARR` which contains `(one two three four five)`
+
+Expected output:
+
+```console
+$ ./set-internal-vars.sh
+Hello World
+100
+3.142
+one, two, three, four, five
+$
+```
+
+### Hints
+
+Creating variables:
+
+Variables can be created either at the shell or in shell-scripts. Any variable created within a shell script is lost when the script stops executing. A variable created at the prompt, however, will remain in existence until the shell is terminated. The syntax for creating a variable is :
+
+`<variable name>=<value>`
+
+> 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!