Add Use A psqlrc File For Common Settings as a postgres til.

postgres/use-a-psqlrc-file-for-common-settings.md

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+# Use A psqlrc File For Common Settings
+
+There are a handful of settings that I inevitably turn on or configure each
+time I open up a `psql` session. I can save myself a little time and sanity
+by configuring these things in a `.psqlrc` dotfile that is located in my
+home directory. Here is what my `~/.psqlrc` file currently looks like:
+
+```
+\x auto
+\timing
+\pset null 'Ø'
+```