Added hyperv-iso builder

windows_10.json

 {
   "builders": [
+    {
+      "type": "hyperv-iso",
+      "vm_name":"windows_10",
+      "iso_url": "{{user `iso_url`}}",
+      "iso_checksum_type": "{{user `iso_checksum_type`}}",
+      "iso_checksum": "{{user `iso_checksum`}}",
+      "boot_wait": "6m",
+      "communicator":"winrm",
+      "winrm_username": "vagrant",
+      "winrm_password": "vagrant",
+      "winrm_timeout" : "4h",
+      "ram_size": "2048",
+      "cpu": "2",
+      "switch_name": "{{user `switch_name`}}",
+      "guest_additions_mode": "none",
+      "shutdown_command": "shutdown /s /t 10 /f /d p:4:1 /c \"Packer Shutdown\"",
+      "disk_size": "{{user `disk_size`}}",
+      "floppy_files": [
+        "{{user `autounattend`}}",
+        "./floppy/WindowsPowershell.lnk",
+        "./floppy/PinTo10.exe",
+        "./scripts/fixnetwork.ps1",
+        "./scripts/disable-screensaver.ps1",
+        "./scripts/disable-winrm.ps1",
+        "./scripts/enable-winrm.ps1",
+        "./scripts/microsoft-updates.bat",
+        "./scripts/win-updates.ps1"
+      ]
+    },
     {
       "type": "vmware-iso",
       "vm_name":"windows_10",