README: Add sockstat

Readme.md

@@ -363,6 +363,13 @@ NOTE: Add image/x-flif Mimetype to get this work (works with gwenview & kolourpa
 
 FORMAT: Arch Linux PKGBUILD script.
 
+**sockstat**
+--------------
+
+Linux variant of [FreeBSD sockstat command](https://www.freebsd.org/cgi/man.cgi?query=sockstat&apropos=0&sektion=0&manpath=FreeBSD+7.1-RELEASE&format=html)
+
+"The sockstat command lists	open Internet or UNIX domain sockets."
+
 **u3d**
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