Add Clear The Screen In psql as a postgres til

postgres/clear-the-screen-in-psql.md

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+# Clear The Screen In psql
+
+The `psql` interactive terminal does not have a built-in way of clearing the
+screen. What I usually do if I really need the screen cleared is quit, run
+`clear` from the shell, and then open a new `psql` session. This is
+unnecessary though. Instead, we can use the `\!` command to execute a shell
+command, in this case, the `clear` command.
+
+```
+> \! clear
+```
+
+This clears the screen in one step and keeps our current session running.
+
+See the [psql
+docs](http://www.postgresql.org/docs/current/static/app-psql.html) for more
+details.