blazor ui message documentation added.

docs/en/UI/Blazor/Message.md

@@ -1,3 +1,101 @@
 # Blazor: UI Message Service
 
-TODO
+UI message service is used to show nice-looking messages to the user as a blocking dialog.
+
+## Quick Example
+
+Simply inject `IUiMessageService` to your page or component and call the `Success` method to show a success message.
+
+```csharp
+namespace MyProject.Blazor.Pages
+{
+    public partial class Index
+    {
+        public IUiMessageService UiMessageService { get; set; }
+
+        public async Task SaveAsync()
+        {
+            await UiMessageService.Success("Your changes have been successfully saved!", "Congratulations");
+        }
+    }
+}
+```
+
+It will show a dialog on the UI:
+
+![blazor-message-success](../../images/blazor-message-success.png)
+
+## Informative Messages
+
+There are four types of informative message functions:
+
+* `Info(...)`
+* `Success(...)`
+* `Warn(...)`
+* `Error(...)`
+
+All of these methods get three parameters:
+
+* `message`: The message (`string`) to be shown.
+* `title`: An optional (`string`) title.
+* `options`: An optional (`Action`) to configure UI message options.
+
+**Example: Show an error message**
+
+````csharp
+UiMessageService.Error('Your credit card number is not valid!');
+````
+
+![blazor-message-success](../../images/blazor-message-error.png)
+
+
+## Confirmation Message
+
+`IUiMessage.Confirm(...)` method can be used to get a confirmation from the user.
+
+**Example**
+
+Use the following code to get a confirmation result from the user:
+
+```csharp
+public async Task DeleteAsync()
+{
+    var confirmed = await UiMessageService.Confirm("Are you sure to delete the 'admin' role?");
+    if(confirmed)
+    {
+        //Delete the 'admin' role here.
+    }
+}
+```
+
+The resulting UI will be like shown below:
+
+![blazor-message-confirm](../../images/blazor-message-confirm.png)
+
+If the user has clicked the `Yes` button, the `Confirm` method's return value will be `true`.
+
+## UI Message Configuration
+
+It is easy to change default UI Message options if you like to customize messages. Provide an `action` to the `options` parameter and change the default values.
+
+```csharp
+await UiMessageService.Success("Your changes have been successfully saved!", "Congratulations", (options) =>
+    {
+        options.MessageIcon = "msg-icon-new";
+        options.CenterMessage = false;
+    });
+```
+
+List of the options that you can change by providing the `action` parameter.
+
+* `CenterMessage` : (Default: true) If true, the message dialogue will be centered on the screen.
+* `ShowMessageIcon` : (Default: true) If true, the message dialogue will show the large icon for the current message type.
+* `MessageIcon` : Overrides the build-in message icon.
+* `OkButtonText` : Custom text for the Ok button.
+* `OkButtonIcon` : Custom icon for the Ok button.
+* `ConfirmButtonText` : Custom text for the Confirmation button.
+* `ConfirmButtonIcon` : Custom icon for the Confirmation button.
+* `CancelButtonText` : Custom text for the Cancel button.
+* `CancelButtonIcon` : Custom icon for the Cancel button.
+
+> "Confirm", "Cancel" and "Yes" texts are automatically localized based on the current language.