docs: add initial README file

README.md

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+# go-varsig
+
+`go-varsig` is an implementation of the `varsig` specification
+
+## Algorithm naming
+
+While there is no strict need for compatibility with JWA/JWT/JWE/JWS, all
+attempts are made to keep the algorithm names here consisten with the
+table provided in section 3.1 of RFC7518 titled "JSON Web Algorithms.  In
+cases where there is no equivalent name for an algorithm, a best-effort
+attempt at creating a name in the spirit of that specification is made.
+
+It should also be noted that algorithm in this context might in fact be a
+pseudonym - for cryptographical signing algorithms that require the signed
+data to be hashed first, these names commonly refer to the combination of
+that signing algorithm and the hash algorithm.
+
+## References
+
+https://github.com/ChainAgnostic/varsig
+https://datatracker.ietf.org/doc/html/rfc7518#section-3.1