postgresql_backup. Adding README to mention .pgpass

postgresql_backup/README.md

@@ -0,0 +1,17 @@
+# Usage
+
+## Authentication
+
+Do not forget to create and/or edit `~/.pgpass` file providing all needed passwords for each host:
+
+The format is the following:
+```csv
+hostname:port:database:username:password
+```
+
+Example
+
+```csv
+localhost:5432:*:postgres:pg_password_1
+localhost:5433:*:postgres:pg_password_2
+```