add example to readme

readme.md

@@ -3,3 +3,29 @@
 Package html provides functions for programmatically composing and rendering HTML and HTML templates.
 
 Docs: https://godocs.io/code.squareroundforest.org/arpio/html
+
+Example:
+
+```
+package main
+
+import (
+	"os"
+	"code.squareroundforest.org/arpio/html"
+	. "code.squareroundforest.org/arpio/html/tag"
+)
+
+func main() {
+	html.RenderIndent(
+		os.Stdout,
+		html.Indent(),
+		Html(
+			Head(Title("Hello, world!")),
+			Body(
+				H1("Hello, world!"),
+				P("This a sample HTML page."),
+			),
+		),
+	)
+}
+```