Browser

Would be nice to use the [Xamarin.Essentials Browser](https://docs.microsoft.com/de-de/xamarin/essentials/open-browser?tabs=android) as default.
Browser in the app (LaunchMode) is better user experience.

My current workaround:

```csharp
markdownView.NavigateToLink = NavigateToLinkAsync;
```

```csharp
private static async void NavigateToLinkAsync(string obj)
{
var options = new BrowserLaunchOptions
{
LaunchMode = BrowserLaunchMode.SystemPreferred,
};
await Browser.OpenAsync(obj, options);
}
```

Thanks for your work!