add example for https://github.com/kataras/iris/issues/1653

_examples/file-server/spa-vue-router/main.go

@@ -0,0 +1,32 @@
+// Package main simply shows how you can getting started with Iris and Vue Router.
+// Read more at: https://router.vuejs.org/guide/#html
+package main
+
+import "github.com/kataras/iris/v12"
+
+func main() {
+	app := iris.New()
+	app.HandleDir("/", "./frontend")
+
+	app.Listen(":8080")
+}
+
+/* For those who want to use HTML template as the index page
+   and serve static files in the root request path
+   and use vue router as the main router of the entire application,
+   please follow the below code example:
+
+func fullVueRouter() {
+	app := iris.New()
+	app.RegisterView(iris.HTML("./views", ".html"))
+	app.OnAnyErrorCode(index)
+	app.HandleDir("/", "./frontend")
+	app.Get("/", index)
+
+	app.Listen(":8080")
+}
+
+func index(ctx iris.Context) {
+	ctx.View("index.html")
+}
+*/