Add socat page

pages/common/socat.md

@@ -0,0 +1,15 @@
+# socat
+
+> Multipurpose relay (SOcket CAT)
+
+- Listen to a port, wait for an incoming connect and transfer data to STDIO.
+
+`socat - TCP-LISTEN:8080,fork`
+
+- Create a connection to a host and port, transfer data in STDIO to connected host.
+
+`socat - TCP4:www.domain.com:80`
+
+- Forward incoming data to a local port to another host and port.
+
+`socat TCP-LISTEN:80,fork TCP4:www.domain.com:80`