Add a simple Caddy+Iris tutorial 👍

Former-commit-id: 8761afce72aa35b91c9b5a958f1cafc027aabddd

_examples/tutorial/caddy/server2/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"github.com/kataras/iris"
+)
+
+func main() {
+
+	app := iris.New()
+
+	app.Controller("/user", new(UserController))
+
+	// GET http://localhost:9092/user
+	// GET http://localhost:9092/user/42
+	// POST http://localhost:9092/user
+	// PUT http://localhost:9092/user/42
+	// DELETE http://localhost:9092/user/42
+	// GET http://localhost:9092/user/followers/42
+	app.Run(iris.Addr(":9092"))
+}
+
+// UserController is our user example controller.
+type UserController struct {
+	iris.Controller
+}
+
+// Get handles GET /user
+func (c *UserController) Get() {
+	c.Ctx.Writef("Select all users")
+}
+
+// GetBy handles GET /user/42
+func (c *UserController) GetBy(id int) {
+	c.Ctx.Writef("Select user by ID: %d", id)
+}
+
+// Post handles POST /user
+func (c *UserController) Post() {
+	username := c.Ctx.PostValue("username")
+	c.Ctx.Writef("Create by user with username: %s", username)
+}
+
+// PutBy handles PUT /user/42
+func (c *UserController) PutBy(id int) {
+	c.Ctx.Writef("Update user by ID: %d", id)
+}
+
+// DeleteBy handles DELETE /user/42
+func (c *UserController) DeleteBy(id int) {
+	c.Ctx.Writef("Delete user by ID: %d", id)
+}
+
+// GetFollowersBy handles GET /user/followers/42
+func (c *UserController) GetFollowersBy(id int) {
+	c.Ctx.Writef("Select all followers by user ID: %d", id)
+}