talk: add page (#11344)

* talk: add page

* talk: fix full stop

* talk: fix newline at eof

pages/linux/talk.md

@@ -0,0 +1,24 @@
+# talk
+
+> GNU/Talk is a visual communication program which copies lines from your terminal to that of another user.
+> More information: <https://www.gnu.org/software/inetutils/manual/html_node/talk-invocation.html>.
+
+- Start a talk session with a user on the same machine:
+
+`talk {{username}}`
+
+- Start a talk session with a user on the same machine, who is logged in on tty3:
+
+`talk {{username}} {{tty3}}`
+
+- Start a talk session with a user on a remote machine:
+
+`talk {{username}}@{{hostname}}`
+
+- Clear text on both terminal screens:
+
+`Ctrl+D`
+
+- Exit the talk session:
+
+`Ctrl+C`