feat(interview questions): Add solutions to common interview problems

[Dushyant100]

[Dushyant100]

@Ansh-Sarkar I would love to contribute on this. I have already created a PR. Kindly check out #23

[Ansh-Sarkar]

Hey @Dushyant100 ! Thank you for the contribution 😄 . I would suggest keeping this issue open for further contributions as well. Your code looks good to me 👍

[shreya2663]

can i do it