Add algorithm for Casimir Effect

[ZeroDayOwl]

Describe your change:

I implemented an algorithm to find out the magnitudes of either Force of attraction, distance or surface area of any of the two parallel plates in vacuum between which there is an existence of Casimir effect, using the general equation for Casimir effect, provided the values of the any of the two parameters are non-zero numbers.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[CaedenPH]

Instead of passing 0, how about all arguments are None, and whichever argument isnt passed is evaluated. Otherwise, something may break if a legitimate value of a parameter is 0

In addition, instead of returning a dictionary of the missing value, you can just return the missing value

[ZeroDayOwl]

Hey @cclauss could you kindly take a look at the PR?

[cclauss]

from math import pi

[cclauss]

Nice!

[ZeroDayOwl]

@cclauss Thanks for the suggestion! I used the module, and also updated the doc tests accordingly!