Add missing README attributes

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Author: tsegismont

README.adoc

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 = Vert.x FIDO2 webauthn for web applications
 :author: Paulo Lopes <[email protected]>
-:toc:
+:page-permalink: /
+:page-github: vertx-howtos/fido2-webauthn-howto
+
 
 This how to will show you how to build and secure a simple https://github.com/herrjemand/awesome-webauthn#server-libs[FIDO2 CONFORMANT] (commonly known as Web Authentication API) vert.x web application. The Web Authentication API (also known as WebAuthn) is a specification written by the W3C and FIDO Alliance, with the participation of Google, Mozilla, Microsoft, Yubico, and others. The API allows servers to register and authenticate users using public key cryptography instead of a password.