reorganization of _examples and add some new examples such as iris+groupcache+mysql+docker

Former-commit-id: ed635ee95de7160cde11eaabc0c1dcb0e460a620

_examples/view/quicktemplate/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"github.com/kataras/iris/v12/_examples/response-writer/quicktemplate/controllers"
+
+	"github.com/kataras/iris/v12"
+)
+
+func newApp() *iris.Application {
+	app := iris.New()
+	app.Get("/", controllers.Index)
+	app.Get("/{name}", controllers.Hello)
+
+	return app
+}
+
+func main() {
+	app := newApp()
+	// http://localhost:8080
+	// http://localhost:8080/yourname
+	app.Listen(":8080")
+}