Add some _examples in the main repository too.

Former-commit-id: 98895c34115ec2076b431332f0ffe9645adf7590

_examples/examples/routes-using-gorillamux/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"gopkg.in/kataras/iris.v6"
+	"gopkg.in/kataras/iris.v6/adaptors/gorillamux"
+)
+
+func main() {
+	app := iris.New()
+	// Adapt the "httprouter", you can use "gorillamux" too.
+	app.Adapt(gorillamux.New())
+
+	userAges := map[string]int{
+		"Alice":  25,
+		"Bob":    30,
+		"Claire": 29,
+	}
+
+	// Equivalent with app.HandleFunc("GET", ...)
+	app.Get("/users/{name}", func(ctx *iris.Context) {
+		name := ctx.Param("name")
+		age := userAges[name]
+
+		ctx.Writef("%s is %d years old!", name, age)
+	})
+
+	app.Listen(":8080")
+}