feat(hello_python): add new py exercise to scripting piscine

sh/tests/hello_python_test.py

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+import sys
+
+sys.path.append('/jail/app/student')
+
+from hello_python import say_hello_python
+
+def test_say_hello_python():
+    assert say_hello_python() == "Hello Python!"

sh/tests/solutions/hello_python.py

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+def say_hello_python():
+    return "Hello Python!"

subjects/devops/hello_python/README.md

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+## Hello Python
+
+Here starts your journey in the marvelous world of Python, a very versatile programming language, popular for being accessible for beginner programmers and yet very powerful.
+
+### Setup
+
+First, you'll need to have Python installed on your machine. In those exercises we use Python 3.10, we then recommend you to install Python 3.10 or higher.
+
+- [Download and install Python](https://www.python.org/downloads/)
+
+To write your code, you may use your favorite IDE. If you don't have one, you can go for Visual Studio Code with Python extension pack installed:
+
+- [Get VS Code](https://code.visualstudio.com/)
+- (Optional) [The Python extension pack](https://marketplace.visualstudio.com/items?itemName=donjayamanne.python-extension-pack).
+
+> Setup may vary in base of your Operating System or machine specificities, if you feel stuck check on internet for the specific steps that suits your configuration.
+
+### Instructions
+
+Create a file `hello_python.py` and write inside a function `say_hello_python` that returns the string `"Hello Python!"`.
+
+```python
+def say_hello_python():
+    # this is a function,
+    # write your code here
+```
+
+### Usage
+
+Here is a possible code to test your function. Put it in another file (ex: `test.py`):
+
+```python
+from hello_python import say_hello_python
+
+print(say_hello_python())
+```
+
+Run your test file with the following command:
+
+```console
+$ python3 test.py
+Hello Python!
+$
+```
+
+> `test.py` file should be in the same directory of `hello_python.py` in order to work.
+
+### Hints
+
+- Python uses indentation to indicate in which block your code will run (many other languages uses parenthesis instead). It is then very important to indent your code properly.
+
+- `return` is a special world used to say which value a function should return (a function could also not return anything).
+For example `return 10` will return the number ten.
+
+- A string is a set of characters wrapped by `"`.
+For example `"Ciao bella"` is a string containing the worlds `Ciao Bella`.
+
+- In `test.py` we are calling another function named `print`. This function is already present in Python standard library so we don't have to create it. This function at its core is made to write strings in the standard output.
+
+### References
+
+- [Indentation in Python](https://www.w3schools.com/python/gloss_python_indentation.asp)
+- [Python print function](https://www.w3schools.com/python/ref_func_print.asp)