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/sessions/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"time"
+
+	"github.com/kataras/iris/v12/_examples/dependency-injection/sessions/routes"
+
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/sessions"
+)
+
+func main() {
+	app := iris.New()
+	sessionManager := sessions.New(sessions.Config{
+		Cookie:       "site_session_id",
+		Expires:      60 * time.Minute,
+		AllowReclaim: true,
+	})
+
+	// Session is automatically binded through `sessions.Get(ctx)`
+	// if a *sessions.Session input argument is present on the handler's function,
+	// which `routes.Index` does.
+	app.Use(sessionManager.Handler())
+
+	// Method: GET
+	// Path: http://localhost:8080
+	app.ConfigureContainer(registerRoutes)
+
+	app.Listen(":8080")
+}
+
+func registerRoutes(api *iris.APIContainer) {
+	api.Get("/", routes.Index)
+}

_examples/dependency-injection/sessions/routes/index.go

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+package routes
+
+import (
+	"fmt"
+
+	"github.com/kataras/iris/v12/sessions"
+)
+
+// Index will increment a simple int version based on the visits that this user/session did.
+func Index(session *sessions.Session) string {
+	// it increments a "visits" value of integer by one,
+	// if the entry with key 'visits' doesn't exist it will create it for you.
+	visits := session.Increment("visits", 1)
+
+	// write the current, updated visits.
+	return fmt.Sprintf("%d visit(s) from my current session", visits)
+}