added a function to calculate perceived frequency by observer using Doppler Effect (#10776)

* avg and mps speed formulae added

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* avg and mps speed formulae added

* fixed_spacing

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* spacing

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* ws

* added amicable numbers

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* added amicable numbers

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* spacing

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* removed

* changed name of file and added code improvements

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* issues fixed due to pi

* requested changes added

* Created doppler_effect_of_sound.py

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* Updated doppler_effect_of_sound.py

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* added desc names

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* fixed spacing

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* renamed doppler_effect_of_sound.py to doppler_frequency.py

* used expection handling rather than print statements

* fixed spacing for ruff

* Update doppler_frequency.py

This is super slick!  Well done.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>