pg_isready: add page (#9271)

pages/common/pg_isready.md

@@ -0,0 +1,16 @@
+# pg_isready
+
+> Check the connection status of a PostgreSQL server.
+> More information: <https://www.postgresql.org/docs/current/app-pg-isready.html>.
+
+- Check connection:
+
+`pg_isready`
+
+- Check connection with a specific hostname and port:
+
+`pg_isready --host={{hostname}} --port={{port}}`
+
+- Check connection displaying a message only when the connection fails:
+
+`pg_isready --quiet`