Add atm-simulator

[Bratajit-03]

Title

Title : ATM-Simulator

Code Stack : HTML,CSS and Javascript

Checklist:

• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have created a helpful and easy to understand README.md
• [X] I have updated the Index.html file for my contribution

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[arpansaha13]

Please do not create a new PR after every review or change. The review can continue in the same PR even after adding new commits.

[Bratajit-03]

@sadanandpai sir ,@arpansaha13 sir, kindly review my PR please.

[sadanandpai]

Do not add more than 1 challenge in the PR. Please keep this only for ATM Simulator

[Bratajit-03]

@sadanandpai sir, i have done the required changes.please review it.

[Bratajit-03]

@arpansaha13 sir, i have resolved all the issues, please kindly check it.