Add OS X option

[ajbeaven]

Would be awesome to have a OS X version of this titlebar considering many electron-react apps will be compiled for Mac as well as Windows.

[KochiyaOcean]

For macOS's menu is not on the window but on the taskbar, it seems useless to create a macOS version.
If you wants to customize titlebar on macOS platform, just use titleBarStyle: 'hidden' option of browserWindow.

[ajbeaven]

I don't see the menu as necessarily being the main draw for using this package. For me the benefit is the consolidation of the code required to customize the titlebar. In both Windows and Mac I'm planning to use a frameless browser window and will use this package to customize the titlebar as per this SO question.

Yeah I'll probably hide the titlebar menu on Mac, but it'd be nice to be able to render the default titlebar (along with any customizations I want to have eg background color) using the same package that I achieve this with on Windows.

[gnattu]

@ajbeaven If you are still interested, a macOS version is maintained here

Current version of Electron has some limit on window control and some bugs on vibrant window appearance, so that package is not able to publish yet.