add documentation and test

docs/en/sql-reference/statements/show.md

@@ -510,3 +510,15 @@ Result:
 **See Also**
 
 -   [system.settings](../../operations/system-tables/settings.md) table
+
+## SHOW ENGINES
+
+``` sql
+SHOW ENGINES [INTO OUTFILE filename] [FORMAT format]
+```
+
+Outputs the content of the [system.table_engines](../../operations/system-tables/table_engines.md) table, that contains description of table engines supported by server and their feature support information.
+
+**See Also**
+
+-   [system.table_engines](../../operations/system-tables/table_engines.md) table

tests/queries/0_stateless/00419_show_sql_queries.sh

@@ -7,3 +7,4 @@ CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
 $CLICKHOUSE_CLIENT -q "SHOW PROCESSLIST" &>/dev/null
 $CLICKHOUSE_CLIENT -q "SHOW DATABASES" &>/dev/null
 $CLICKHOUSE_CLIENT -q "SHOW TABLES" &>/dev/null
+$CLICKHOUSE_CLIENT -q "SHOW ENGINES" &>/dev/null