added multicurrency change calculator

[chinmayr633]

Issue Id you have worked upon -

359

Briefly explain your program logic -

A Multicurrency change calculator used in retail helps cashiers determine the precise denominations of coins and bills to give as change to customers after a purchase, making transactions accurate and efficient. It can also switch between different currency denominations if needed.

Screenshots(Attach 2 screenshots of your own input and output) -

By raising this PR I affirm that -

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[SarthakKeshari]

@chinmayr633, I see you have mixed Metric unit code. So, I have reverted your PR. Kindly raise a new PR. This PR won't be considered for Hacktoberfest.