feat: add summary changes

Signed-off-by: Manan Gupta <[email protected]>

changelog/19.0/19.0.0/summary.md

@@ -6,6 +6,8 @@
   - **[Deprecations and Deletions](#deprecations-and-deletions)**
   - **[Docker](#docker)**
     - [New MySQL Image](#mysql-image)
+  - **[VTGate](#vtgate)**
+    - [`SHOW VSCHEMA KEYSPACES` Query](#show-vschema-keyspaces)
 
 ## <a id="major-changes"/>Major Changes
 
@@ -21,3 +23,23 @@ In `v19.0` the Vitess team is shipping a new image: `vitess/mysql`.
 This lightweight image is a replacement of `vitess/lite` to only run `mysqld`.
 
 Several tags are available to let you choose what version of MySQL you want to use: `vitess/mysql:8.0.30`, `vitess/mysql:8.0.34`.
+
+### <a id="vtgate"/>VTGate
+
+#### <a id="show-vschema-keyspaces"/>`SHOW VSCHEMA KEYSPACES` Query
+
+A SQL query, `SHOW VSCHEMA KEYSPACES` is now supported in Vitess. This query prints the vschema information
+for all the keyspaces. It is useful for seeing the foreign key mode, whether the keyspace is sharded, and if there is an
+error in the keyspace.
+
+An example output of the query looks like - 
+```sql
+mysql> show vschema keyspaces;
++---------------+---------+------------------+-------+
+| Keyspace Name | Sharded | Foreign Key Mode | Error |
++---------------+---------+------------------+-------+
+| uks           | false   | managed          |       |
+| ks            | true    | managed          |       |
++---------------+---------+------------------+-------+
+2 rows in set (0.00 sec)
+```

go/vt/sqlparser/parse_test.go

@@ -2369,6 +2369,8 @@ var (
 		input: "show vitess_targets",
 	}, {
 		input: "show vschema tables",
+	}, {
+		input: "show vschema keyspaces",
 	}, {
 		input: "show vschema vindexes",
 	}, {