Build instructions

[tvw]

It would be great, if the README would contain some build instructions. I tried go install filippo.io/age/cmd/...@latest, but I got nothing but this:

go: downloading filippo.io/age v1.2.0
go: downloading golang.org/x/term v0.21.0
go: downloading golang.org/x/crypto v0.24.0
go: downloading golang.org/x/sys v0.21.0
go: downloading filippo.io/edwards25519 v1.1.0

Then I cloned the age repo and did this go build cmd, but I do not see a result, though my machine was busy for a few minutes.

I am not a C-programmer, but I compile C-projects since my first Linux distro, where it was normal, to compile the kernel in order to meet the hardware of the computer. C-projects do have install instructions and standard build processes, which makes compiling and installing the software easy. Age does not even have a Makefile or any file, that may be a hint to a build procedure. And go build cmd does not even produce some output. So I am puzzled now.