chore(cargo): add SPDX license identifier and include README in the crate

Author: AlfioEmanueleFresta

libwebauthn/Cargo.toml

@@ -4,7 +4,9 @@ description = "FIDO2 (WebAuthn) and FIDO U2F platform library for Linux written
 version = "0.5.0"
 authors = ["Alfie Fresta <alfie.fresta@gmail.com>"]
 edition = "2021"
+license = "LGPL-2.1-or-later"
 license-file = "../COPYING"
+readme = "../README.md"
 homepage = "https://github.com/linux-credentials"
 repository = "https://github.com/linux-credentials/libwebauthn"
 resolver = "2"