mkfs.f2fs: add page (#12564)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/mkfs.f2fs.md

@@ -0,0 +1,12 @@
+# mkfs.f2fs
+
+> Creates an F2FS filesystem inside a partition.
+> More information: <https://manned.org/mkfs.f2fs>.
+
+- Create an F2FS filesystem inside partition 1 on device b (`sdb1`):
+
+`sudo mkfs.f2fs {{/dev/sdb1}}`
+
+- Create an F2FS filesystem with a volume label:
+
+`sudo mkfs.f2fs -l {{volume_label}} {{/dev/sdb1}}`