feat: add 'vol' command

programs/man/vol.1

@@ -0,0 +1,34 @@
+.TH VOL 1
+.SH NAME
+    vol - list mounted volumes
+
+.SH SYNOPSIS
+    vol
+
+.SH DESCRIPTION
+    Prints information about volumes present on the system.
+
+    Drive numbers (column "Vol") represent volumes rather than physical disk devices.
+
+    The boot ramdisk, if present, reports "-" for its size, disk, and partition.
+
+.SH OUTPUT
+    Vol   Type     Label                    Size  Disk  Part  Partition
+    0:/   ramdisk  MontaukOS                   -     -     -  -
+    1:/   ext2     Montauk             118.4 GiB     0     0  Montauk
+    2:/   FAT32    EFI                 512.0 MiB     0     1  EFI System
+
+    Disks:
+      0  NVMe   Samsung SSD 990 PRO 1TB
+
+.SH COLUMNS
+    Vol         Drive number, as written in paths ("1:/file.txt").
+    Type        Filesystem type (ext2, FAT32, ramdisk).
+    Label       Filesystem volume label, or "-" if unset.
+    Size        Partition size, binary prefixes.
+    Disk        Block device index (see disk legend below the table).
+    Part        Partition index on that disk.
+    Partition   GPT partition name, or "-" if unset.
+
+.SH SEE ALSO
+    disks(1), shell(1), syscalls(2)