add chat example

example/chat/controllers/default.go

@@ -0,0 +1,14 @@
+package controllers
+
+import (
+	"github.com/astaxie/beego"
+)
+
+type MainController struct {
+	beego.Controller
+}
+
+func (this *MainController) Get() {
+	this.Data["host"] = this.Ctx.Request.Host
+	this.TplNames = "index.tpl"
+}