add a simple hero template example as requested at https://github.com/kataras/iris/issues/840

Former-commit-id: 1c65190d21a5febbbbad1b2b565f82f749278d48

_examples/http_responsewriter/hero/app.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bytes"
+	"log"
+
+	"github.com/kataras/iris/_examples/http_responsewriter/hero/template"
+
+	"github.com/kataras/iris"
+)
+
+// $ go get -u github.com/shiyanhui/hero/hero
+// $ go run app.go
+//
+// Read more at https://github.com/shiyanhui/hero/hero
+func main() {
+
+	app := iris.New()
+
+	app.Get("/users", func(ctx iris.Context) {
+		var userList = []string{
+			"Alice",
+			"Bob",
+			"Tom",
+		}
+
+		// Had better use buffer sync.Pool.
+		// Hero exports GetBuffer and PutBuffer for this.
+		//
+		// buffer := hero.GetBuffer()
+		// defer hero.PutBuffer(buffer)
+		buffer := new(bytes.Buffer)
+		template.UserList(userList, buffer)
+
+		if _, err := ctx.Write(buffer.Bytes()); err != nil {
+			log.Printf("ERR: %s\n", err)
+		}
+	})
+
+	app.Get("/users2", func(ctx iris.Context) {
+		var userList = []string{
+			"Alice",
+			"Bob",
+			"Tom",
+		}
+
+		// using an io.Writer for automatic buffer management (i.e. hero built-in buffer pool),
+		// iris context implements the io.Writer by its ResponseWriter
+		// which is an enhanced version of the standar http.ResponseWriter
+		// but still 100% compatible.
+		template.UserListToWriter(userList, ctx)
+	})
+
+	app.Run(iris.Addr(":8080"))
+}