Add some _examples in the main repository too.

Former-commit-id: 98895c34115ec2076b431332f0ffe9645adf7590

_examples/examples/sessions/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"gopkg.in/kataras/iris.v6"
+	"gopkg.in/kataras/iris.v6/adaptors/httprouter"
+	"gopkg.in/kataras/iris.v6/adaptors/sessions"
+)
+
+var (
+	key = "my_sessionid"
+)
+
+func secret(ctx *iris.Context) {
+
+	// Check if user is authenticated
+	if auth, _ := ctx.Session().GetBoolean("authenticated"); !auth {
+		ctx.EmitError(iris.StatusForbidden)
+		return
+	}
+
+	// Print secret message
+	ctx.WriteString("The cake is a lie!")
+}
+
+func login(ctx *iris.Context) {
+	session := ctx.Session()
+
+	// Authentication goes here
+	// ...
+
+	// Set user as authenticated
+	session.Set("authenticated", true)
+}
+
+func logout(ctx *iris.Context) {
+	session := ctx.Session()
+
+	// Revoke users authentication
+	session.Set("authenticated", false)
+}
+
+func main() {
+	app := iris.New()
+	app.Adapt(httprouter.New())
+
+	sess := sessions.New(sessions.Config{Cookie: key})
+	app.Adapt(sess)
+
+	app.Get("/secret", secret)
+	app.Get("/login", login)
+	app.Get("/logout", logout)
+
+	app.Listen(":8080")
+}