First stab at WebAuthn topic

Author: leereilly

topics/webauthn/index.md

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+---
+created_by: W3C
+display_name: WebAuthn
+released: '2019'
+short_description: WebAuthn is a W3C standard for password-free login on the web.
+topic: webauthn
+related: authentication, ctap, fido2, fido, u2f
+url: https://www.w3.org/TR/webauthn/
+wikipedia_url: https://en.wikipedia.org/wiki/WebAuthn
+---
+WebAuthn is a web standard published by the World Wide Web Consortium (W3C) to standardize an interface for authenticating users to web-based applications and services using public-key cryptography.