Algo added

[rishabhkemni]

• Used in cryptography, the RSA algorithm is known for its complexity in terms of factoring large prime numbers

Describe your change:

The RSA algorithm is a widely used public-key cryptosystem that enables secure data transmission. It involves generating a pair of keys: a public key for encryption and a private key for decryption. The program you have generates these keys, encrypts a message, and then decrypts it.

https://spyscape.com/article/can-you-crack-these-10-mind-boggling-ciphers-and-codes

• [x] Add an algorithm?

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new Python files are placed inside an existing directory.
• [x] All filenames are in all lowercase characters with no spaces or dashes.
• [x] All functions and variable names follow Python naming conventions.
• [x] All function parameters and return values are annotated with Python type hints.
• [x] All functions have doctests that pass the automated testing.
• [x] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [x] If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".