Add pgcat (#429)

Co-authored-by: Kaarel Moppel <[email protected]>

Author: kingluo

README.md

@@ -151,6 +151,7 @@
 * [pg_search](https://github.com/paradedb/paradedb/tree/dev/pg_search) - pg_search is a PostgreSQL extension that enables full-text search over SQL tables using the BM25 algorithm, the state-of-the-art ranking function for full-text search.
 * [pg_cron](https://github.com/citusdata/pg_cron) - Run periodic jobs in PostgreSQL.
 * [pglogical](https://github.com/2ndQuadrant/pglogical) - Extension that provides logical streaming replication.
+* [pgcat](https://github.com/kingluo/pgcat) - Enhanced PostgreSQL logical replication
 * [pg\_barcode](https://github.com/btouchard/pg_barcode/) - PostgreSQL SVG QRcode & Datamatrix generator.
 * [pg\_partman](https://github.com/pgpartman/pg_partman) - Partition management extension for PostgreSQL.
 * [pg\_paxos](https://github.com/citusdata/pg_paxos/) - Basic implementation of Paxos and Paxos-based table replication for a cluster of PostgreSQL nodes.