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

subjects/devops/candidates_checker/README.md

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+## Candidates checker
+
+### Instructions
+
+Create a file `candidates_checker.py` which will receive the number of candidates as the only argument.
+
+This argument will always be convertible to `int`, the script will then ask for each candidate the name as string and the age as number.
+
+Once the information for each candidate is retrieved for each of them the script will check the age and print one of the following results:
+- `"[name] is not eligible (underaged)"` when the age is less than 18.
+- `"[name] is not eligible (over the legal age)"` when the age is more than 60.
+- `"[name] is eligible"` when the age is between 18 and 60 (included).
+
+> You must use dictionaries to save the data about the candidates.
+
+### Usage
+
+Here is an example of your script running:
+
+```console
+$ python3 candidates_checker.py 3
+Add a new candidate:
+name: Edoardo
+age: 17
+Add a new candidate:
+name: Michele
+age: 60
+Add a new candidate:
+name: Lea
+age: 61
+Edoardo is not eligible (underaged)
+Michele is eligible
+Lea is not eligible (over the legal age)
+$
+```
+
+### Hints
+
+- In order to succeed your script should print **exactly** the same output as the one in the usage section. So `Add a new candidate`, `name: ` and `age: ` should be written in the exact same way and order.
+
+- Tough it is not mandatory you could use `if __name__ == '__main__':` to specify the entrypoint of your script.
+
+### References
+
+- [Function strip()](https://docs.python.org/3.11/library/stdtypes.html?highlight=strip#str.strip)
+- [String multiplication](https://www.geeksforgeeks.org/create-multiple-copies-of-a-string-in-python-by-using-multiplication-operator/)
+- [Entrypoint for a Python script](https://realpython.com/if-name-main-python/)