func (c *Container) Create(filename string) {
	Create(filename, c.Render())
}
Save the HTML container as a file.
Takes the filename as parameter.
package frongo
import (
	"html/template"
	"os"
)
func (d *Document) Create(filename string) {
	content := template.HTML("")
	for _, c := range d.Containers {
		content += c.Render()
	}
	Create(filename, content)
}