Update 102-forms-and-validations.md

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content/roadmaps/100-frontend/content/101-html/102-forms-and-validations.md

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 # Forms and validations
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+Many websites allow the user to submit and request information using forms. While doing this it is important to ensure all form controls are filled out correctly.
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+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Learn/Forms/Form_validation'>MDN Web Docs: Client-side form validation</BadgeLink>