Document authentication

How to pass the password to the PSQL connection is not obvious from the current documentation. Add a basic example with links to the more documentation.
dalibo · Dec 2, 2021 · a356391 · a356391
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diff --git a/README.md b/README.md
@@ -125,6 +125,14 @@ Navigation mode
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+Authentication
+--------------
+
+You can pass the password for the database connection in `PGPASSWORD` 
+in environment variable, or other 
+[PostgreSQL environment variable](https://www.postgresql.org/docs/current/libpq-envars.html)
+supported by `psycopg2` library.
+
 FAQ
 ---