README.md mention usign

[stokito]

The usign was already discussed in #29 but missing in the README.

I trying to understand and have some stupid question.

1. Why not just to use gpg? Is anything wrong with the gpg except of it's size. So far it looks like the gpg didn't supported the ed25519. It supports them today but you still need to use some extra options.
2. Why the signify .sig files aren't compatible with PGP format? As far I understood the gpg sig files are slightly bigger and have more fields [1]
3. Similar question but for key files: they have own format and my file manager doesn't recognize them as key files and doesn't show an icon for example. Also the secret file must have the .sec extension while usually the secret files have .key prefix.

I really don't like that in such critical things like cryptography so easy to mess with something because so many programs that duplicates each other, lack of interoperability and tutorials differs significantly.

[1] https://www.rfc-editor.org/rfc/rfc4880.html#section-5.2.3

[stokito]

Answering to my questions: the GnuPGP didn't supported the ed25519 and overcompensated. Today it's not that big problem but anyway it would be better to use a more standard PKCS#7 detached signature .p7s file.

[aperezdc]

Thanks @stokito