Add Vigenere Cipher

[Siddhi-Mundada]

I would like to add Vigenere Cipher Encryption Calculator. Vigenere Cipher is a method of encrypting alphabetic text. It uses a simple form of [polyalphabetic substitution].A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets. The encryption of the original text is done using the [Vigenère square or Vigenère table]. I will create user-friendly and attractive UI. User will type the plaintext and key the cipher text will be generated.

Please assign this issue to me under GSSOC 22. Thanks in Advance!

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[github-actions[bot]]

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