Create timer_cagan_atan.py

[Starosti]

Describe your changes

Checklist

• I have read the [CONTRIBUTING]
• I have performed a self-review of my own code
• I have run the code locally and it works as expected
• I have commented my code, particularly in hard-to-understand areas

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[canbula]

Why do you return False with your __exit__ method?

[Starosti]

Why do you return False with your __exit__ method?

I've added that return because I thought we needed to return False if we didn't handle the exception, as we need to return True if we handled it. Now I've read more on it I realized that I can just return anything except True and it will be fine. I have edited the code accordingly.

[canbula]

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