Add readme

Author: Maxime Besson

README.md

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+# Authen::WebAuthn
+
+A library to add [Web Authentication](https://www.w3.org/TR/webauthn-2/) support to server applications
+
+![](image.png){width=100%}
+
+# Status
+
+* Authentication works
+* ECC/RSA keys supported
+* Registration works with "none" attestation type
+
+# TODO
+
+* Support more attestation types
+* Support more public key types (EdDSA...)
+* Support attestation authority certificates
+    * Support FIDO Metadata Service
+* Handle request creation too
+
+# Documentation
+
+https://metacpan.org/pod/Authen::WebAuthn