readme updated

ui/dialogs/Readme.md

@@ -22,6 +22,28 @@ dialogs.prompt("Some message", "Default text for the input", {
     title: "My custom title", okButtonText: "Yes",
     cancelButtonText: "No", neutralButtonText: "Not sure", inputType: dialogs.InputType.Password
 }).then(function (r) { dialogs.alert("Boolean result: " + r.result + ", entered text: " + r.text); });
+
+dialogs.login("Enter your user name and password:").then(function(r) {
+        dialogs.alert("Result:" + r.result + " User name:" + r.userName + " Password:" + r.password);
+   });
+
+dialogs.login("Enter your user name and password:", "", "",
+                {
+                    title: "Login",
+                    okButtonText: "Sign In",
+                    cancelButtonText: "Cancel",
+                    neutralButtonText:"Sign Up"
+                })
+  .then(function(r) {
+        dialogs.alert("Result:" + r.result + " User name:" + r.userName + " Password:" + r.password);
+		if(r.result) {
+			// login here
+		} else if(r.result === false) {
+			// perform something on cancel if you want
+		} else if(r.result === "undefined") {
+			// you can create new user credentials here for example
+		}
+   }).fail(function(e){ console.log(e)});
 ```
 Custom dialogs:
 ```js