[Term Entry]: Add Postel's Law

[AnamolR]

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This entry introduces Postel's Law (also known as the Robustness Principle), a UX design principle that encourages systems to accept varied input while maintaining consistent output. It’s highly relevant for form inputs, error handling, and interface resilience.

The entry includes:

• An introduction to the principle
• Its relevance to UX
• Practical applications in interface and input design
• Benefits and limitations

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• New Term Entry for Existing Topic

Linked Pull Request

Closes PR #6549

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New Term for Existing Concept Entry

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[AnamolR]

Hi @Sriparno08, please assign me to the PR that I've created #6549

[Sriparno08]

Hey @AnamolR, you’re assigned!

In addition to the documents linked in the description, please also look at the Contribution Guide. After creating a PR, the maintainer(s) (with the collaborator label) will add comments/suggestions to address any revisions before approval.