Create mount-hvm-disk.md

How to mount a HVM disk. 
Not directly related to Qubes OS ( related to LVM only) 
But useful to know

debugging/mount-hvm-disk.md

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+---
+layout: doc
+title: Mount HVM disk
+permalink: /doc/mount-hvm-disk/
+---
+
+# How to mount HVM disk 
+
+You want to read your HVM disk (ex: you did some errors and can't start the HVM ). 
+
+First, read the partition table:
+
+```bash
+sudo parted /dev/YOUR_VG/YOUR_VM unit B print
+```
+
+Example:
+
+```
+$:sudo parted /dev/windows-vg/vg-game-root unit B print
+Model: Linux device-mapper (thin) (dm)
+Disk /dev/dm-138: 314572800000B
+Sector size(logical/physical): 512B/512B
+Partition Table: msdos
+Disk Flags:
+Number       Start          End            Size           Type     File system  Flags
+1            1048576B       105906175B     104857600B     primary  ntfs         boot
+2            105906176B     314571751423B  314465845248B  primary  ntfs
+```
+
+Then mount the partition you want:
+
+```bash
+sudo mount -o loop,offset=105906176 -t ntfs /dev/windows-vg/vg-game-root /mnt/
+```