check-dfsg-status: add page (#12376)

* check-dfsg-status: add page

---------

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

pages/linux/check-dfsg-status.md

@@ -0,0 +1,13 @@
+# check-dfsg-status
+
+> Report non-free packages installed on Debian-based OSes.
+> This command was formerly known as `vrms`.
+> More information: <https://debian.pages.debian.net/check-dfsg-status/>.
+
+- List non-free and contrib packages (and their description):
+
+`check-dfsg-status`
+
+- Only output the package names:
+
+`check-dfsg-status --sparse`