Create README.md

Explains the features of the widget.

Author: alkaChaudhary73

Modern Development/Service Portal Widgets/Signature Pad Widget/README.md

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+A lightweight ServiceNow Service Portal widget that allows users to draw, clear, and attach signatures using a <canvas> element, compatible with both desktop and mobile devices.
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+Features
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+Draw signature using mouse or touch input.
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+Clear the signature pad with one click.
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+Convert the signature to a Base64 PNG string for storage or submission.
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+No external dependencies (pure JavaScript & HTML5 Canvas).