new simple _examples/README.md, wiki should live only inside kataras/iris/wiki and the provided e-book

Former-commit-id: 350eafb0f70f8433e394e103ff93fa332ee00a05

_examples/dependency-injection/overview/web/routes/hello.go

@@ -0,0 +1,50 @@
+// file: web/routes/hello.go
+
+package routes
+
+import (
+	"errors"
+
+	"github.com/kataras/iris/v12/hero"
+)
+
+var helloView = hero.View{
+	Name: "hello/index.html",
+	Data: map[string]interface{}{
+		"Title":     "Hello Page",
+		"MyMessage": "Welcome to my awesome website",
+	},
+}
+
+// Hello will return a predefined view with bind data.
+//
+// `hero.Result` is just an interface with a `Dispatch` function.
+// `hero.Response` and `hero.View` are the builtin result type dispatchers
+// you can even create custom response dispatchers by
+// implementing the `github.com/kataras/iris/hero#Result` interface.
+func Hello() hero.Result {
+	return helloView
+}
+
+// you can define a standard error in order to re-use anywhere in your app.
+var errBadName = errors.New("bad name")
+
+// you can just return it as error or even better
+// wrap this error with an hero.Response to make it an hero.Result compatible type.
+var badName = hero.Response{Err: errBadName, Code: 400}
+
+// HelloName returns a "Hello {name}" response.
+// Demos:
+// curl -i http://localhost:8080/hello/iris
+// curl -i http://localhost:8080/hello/anything
+func HelloName(name string) hero.Result {
+	if name != "iris" {
+		return badName
+	}
+
+	// return hero.Response{Text: "Hello " + name} OR:
+	return hero.View{
+		Name: "hello/name.html",
+		Data: name,
+	}
+}