Support for Windows 10 has been introduced for these products:
- ESXi 5.5, ESXi 5.5 Update 1, ESXi 5.5 Update 2 and ESXi 6.0
- Installation instruction can be found here http://partnerweb.vmware.com/GOSIG/Windows_10.html
For more information about software and hardware support, please check the VMware Compatibility Guide