pg_restore/pg_dump: add page

pages/common/pg_dump.md

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+# pg_dump
+
+> Extract a PostgreSQL database into a script file or other archive file
+
+- Dump database into a SQL-script file:
+
+`pg_dump {{db_name}} > {{output_file.sql}}`
+
+- Same as above, customize username:
+
+`pg_dump -U {{username}} {{db_name}} > {{output_file.sql}}`
+
+- Same as above, customize host and port:
+
+`pg_dump -h {{host}} -p {{port}} {{db_name}} > {{output_file.sql}}`
+
+- Dump a database into a custom-format archive file:
+
+`pg_dump -Fc {{db_name}} > {{output_file.dump}}`