lvmdump: add page (#18052)

* Create lvmdump.md

---------

Co-authored-by: Fazle Arefin <fazlearefin@users.noreply.github.com>
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/linux/lvmdump.md

@@ -0,0 +1,21 @@
+# lvmdump
+
+> Collect diagnostic information about LVM2 (Logical Volume Manager).
+> By default, outputs a compressed tar archive with system and configuration data in the home directory.
+> More information: <https://manned.org/lvmdump>.
+
+- Generate a basic dump:
+
+`lvmdump`
+
+- Generate an extended dump with metadata and daemon info:
+
+`lvmdump -a -l -m`
+
+- Dump the information into a directory instead of a tarball:
+
+`lvmdump -d {{path/to/directory}}`
+
+- Display help:
+
+`lvmdump -h`