add embed example for go 1.16

[circa10a]

Go embedding was released in Go 1.16 yesterday. This PR is to add an example for how to use it with the filesystem middleware

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[hi019]

That was fast, thank you! Can we also put a notice about recommending this over the other solutions listed?

If your environment (Go 1.16+) supports it, we recommend using Go Embed instead of the other solutions listed as this one is native to Go and the easiest to use.

[circa10a]

That was fast, thank you! Can we also put a notice about recommending this over the other solutions listed?

If your environment (Go 1.16+) supports it, we recommend using Go Embed instead of the other solutions listed as this one is native to Go and the easiest to use.

Added 👍

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[jorgefuertes]

Good idea, but seems needed to make an example to embed a static tree, not only one file, I'm stuck in that right now. Thanks!

[jorgefuertes]

Please, note this in order to serve a directory tree:

//go:embed public
var public embed.FS

subFS, _ := fs.Sub(public, "public")
app.Use("/", filesystem.New(filesystem.Config{
	Root: http.FS(subFS),
}))

[chiroro-jr]

Thank you so much for this merge. I was looking for something exactly like this to serve static assets from an embedded filesystem.