bcachefs: add page (#10759)

* bcachefs: add page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/linux/bcachefs.md

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+# bcachefs
+
+> Manage `bcachefs` filesystems/devices.
+> More information: <https://bcachefs.org/bcachefs-principles-of-operation.pdf>.
+
+- Format a partition with `bcachefs`:
+
+`sudo bcachefs format {{path/to/partition}}`
+
+- Mount a `bcachefs` filesystem:
+
+`sudo bcachefs mount {{path/to/partition}} {{path/to/mountpoint}}`
+
+- Create a RAID 0 filesystem where an SSD acts as a cache and an HDD acts as a long-term storage:
+
+`sudo bcachefs format --label=ssd.ssd1 {{path/to/ssd/partition}} --label=hdd.hdd1 {{path/to/hdd/partition}} --replicas=1 --foreground_target=ssd --promote_target=ssd --background_target=hdd`
+
+- Mount a multidevice filesystem:
+
+`sudo bcachefs mount {{path/to/partition1}}:{{path/to/partition2}} {{path/to/mountpoint}}`
+
+- Display disk usage:
+
+`bcachefs fs usage --human-readable {{path/to/mountpoint}}`
+
+- Display help:
+
+`bcachefs`