Step 1:
You would need to modify the client's source to do this, adding a button to your main menu (Intersect.Client.Interface.Menu.MainMenu.cs), like so:
private readonly Button mWebsiteButton;
mWebsiteButton = new Button(mMenuWindow, "WebsiteButton");
mWebsiteButton.SetText(Strings.MainMenu.Website);
mWebsiteButton.Clicked += WebsiteButton_Clicked;
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Step 2:
Then, also in (Intersect.Client.Interface.Menu.MainMenu.cs), add a button event, something like:
private void WebsiteButton_Click(object sender, EventArgs e)
{
// Launch browser to ascensiongamedev...
System.Diagnostics.Process.Start("http://www.ascensiongamedev.com");
}
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Step 3:
Lastly, in (Intersect.Client.Localisation.Strings.cs , find "public partial struct MainMenu") add the JsonProperty:
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
public static LocalizedString Website = @"Website";
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Feel free to modify and customize the new button under "WebsiteButton": { , this piece of code will be in your client's resources (yourClient\resources\gui\layouts\menu\MenuWindow.json)
Sadly, you need source modifications to add a new button, so if you have some coding knowledge, load up visual studio and follow the steps above. If not, sorry that I couldn't help you