Add Pink Calculator Web App

[google-labs-jules]

Implemented a web-based calculator that replicates the visual design of the provided pink calculator image.

• HTML: Created the layout with a display screen and a 5x5 button grid.
• CSS: Styled the calculator with a pink color scheme, rounded corners, and 3D button effects to match the reference image. Used a monospace font for the digital display.
• JavaScript: Implemented core calculator logic including arithmetic operations, percentage, square root, memory functions, and clear/backspace features.

Verified the implementation with Playwright screenshots ensuring both visual fidelity and functional correctness.

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PR created automatically by Jules for task 4762318734152979286 started by @suyashkumar

[google-labs-jules]

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