How to create a bootable usb for OS X on Windows?
Did you tried Google ?

https://www.google.fr/search?client=safari&amp;rls=en&amp;q=How+to+create+a+bootable+usb+for+OS+X+on+Windows+%3F+-+Ask+Different&amp;ie=UTF-8&amp;oe=UTF-8&amp;gfe_rd=cr&amp;ei=ovcpVvzQFYex8weYkpKQDQ



Use TransMac, which has a 15-day trial period and works flawlessly.


In the left pane, right click the USB Drive and select Restore with Disk Image
Point to your .dmg file and click Open.




It will take a few minutes depending on size of .dmg and speed of USB drive, but once done you can pop it into your mac, hold down the option key when turning on the mac and choose the USB drive.

https://superuser.com/questions/383235/create-a-bootable-usb-drive-from-a-dmg-file-on-windows