[PR] Hide status bar when side menu open

I've spent long hour to modify sidebar navigation to hide status bar when side menu open. I want to create pull request but due to my lack of knowledge, I just wrote my code in this page.

In the "Xamarin-Sidebar-Unified" project, find the "Sidebar.cs" file and make some change with below code

1) Add HideStatusBar member variable in the line 99
`
public bool HideStatusBar { get; set; }
`

2) Add Default value of HideStatusBar in the SetDefaults() methods in the line 225
`
HideStatusBar = true;
`

3) Add the setstatusbarhidden method in the OpenMenu(), CloseMenu() method in the line 121 like this

```
public void OpenMenu()
{
if (IsOpen || Disabled)
return;
ShowShadow();
_sidebarContentArea.BeforeOpenAnimation();
// INSERT THIS CODE
if (HideStatusBar)
UIApplication.SharedApplication.SetStatusBarHidden(true, UIStatusBarAnimation.Slide);
// INSERT THIS CODE

UIView.Animate(
Sidebar.SlideSpeed,
0,
UIViewAnimationOptions.CurveEaseInOut,
() => {
_sidebarContentArea.OpenAnimation(MenuLocation, MenuWidth);

},
() => {
_sidebarContentArea.AfterOpenAnimation(TapGesture);
IsOpen = true;
});
}

public void CloseMenu(bool animate = true)
{
if (!IsOpen || Disabled)
return;
MenuViewController.View.EndEditing(true);
// INSERT THIS CODE
if(HideStatusBar)
UIApplication.SharedApplication.SetStatusBarHidden(false, UIStatusBarAnimation.Slide);
// INSERT THIS CODE
UIView.Animate(
animate ? Sidebar.SlideSpeed : 0,
0,
UIViewAnimationOptions.CurveEaseInOut,
() => { _sidebarContentArea.CloseAnimation(); },
() => {
_sidebarContentArea.AfterCloseAnimation(TapGesture);
IsOpen = false;
});
HideShadow();
}
```

4) Build the "Xamarin-Sidebar-Unified" project

5) Open the Project options and check the output path

6) In the output path folder, find the Xamarin-Sidebar-Unified.dll

7) Open your own project

8) Edit References -> .Net Assembly -> Browse -> (Above output path) -> select Xamarin-Sidebar-Unified.dll

9) Open Info.plist with text editor (like sublime text) to add this key value pair inside area
UIViewControllerBasedStatusBarAppearance