Add README and list of features

README.md

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+# JSON Web Tokens
+
+This library implement signing and verification of [JSON Web Tokens][], or JWTs,
+based on [RFC 7159][].
+
+[json web tokens]: https://jwt.io/
+[rfc 7159]: https://datatracker.ietf.org/doc/html/rfc7519
+
+## Features
+
+-   [x] [JWS][] tokens
+-   [ ] [JWE][] tokens
+-   [x] Sign
+-   [x] Verify
+-   [ ] iss check
+-   [ ] sub check
+-   [ ] aud check
+-   [ ] exp check
+-   [ ] nbf check
+-   [ ] iat check
+-   [ ] jti check
+-   [ ] typ check
+
+[JWS]: https://datatracker.ietf.org/doc/html/rfc7515
+[JWE]: https://datatracker.ietf.org/doc/html/rfc7516
+
+Encryption algorithms:
+
+-   [x] HS256
+-   [ ] HS384
+-   [ ] HS512
+-   [ ] PS256
+-   [ ] PS384
+-   [ ] PS512
+-   [ ] RS256
+-   [ ] RS384
+-   [ ] RS512
+-   [ ] ES256
+-   [ ] ES256K
+-   [ ] ES384
+-   [ ] ES512
+-   [ ] EdDSA