add 'iris.Blocks' template engine

read more about its features at: https://github.com/kataras/blocks

_examples/view/template_blocks_0/main.go

@@ -0,0 +1,35 @@
+package main
+
+import "github.com/kataras/iris/v12"
+
+func main() {
+	app := iris.New()
+	// Read about its syntax at: https://github.com/kataras/blocks
+	app.RegisterView(iris.Blocks("./views", ".html").Reload(true))
+
+	app.Get("/", index)
+	app.Get("/500", internalServerError)
+
+	app.Listen(":8080")
+}
+
+func index(ctx iris.Context) {
+	data := iris.Map{
+		"Title": "Page Title",
+	}
+
+	ctx.ViewLayout("main")
+	ctx.View("index", data)
+}
+
+func internalServerError(ctx iris.Context) {
+	ctx.StatusCode(iris.StatusInternalServerError)
+
+	data := iris.Map{
+		"Code":    iris.StatusInternalServerError,
+		"Message": "Internal Server Error",
+	}
+
+	ctx.ViewLayout("error")
+	ctx.View("500", data)
+}