diskpart: add page (#7091)

pages/windows/diskpart.md

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+# diskpart
+
+> Disk, volume and partition manager.
+> More information: <https://docs.microsoft.com/windows-server/administration/windows-commands/diskpart>.
+
+- Run diskpart by itself in an administrative command prompt to enter its command line:
+
+`diskpart`
+
+- List all disks:
+
+`list disk`
+
+- Select a volume:
+
+`select volume {{volume}}`
+
+- Assign a drive letter to the selected volume:
+
+`assign letter {{letter}}`
+
+- Create a new partition:
+
+`create partition primary`
+
+- Activate the selected volume:
+
+`active`
+
+- Exit diskpart:
+
+`exit`