docs: add st_relate.qmd documentation file

Author: mehakarora3010-dotcom

docs/reference/sql/st_relate.qmd

@@ -0,0 +1,34 @@
+---
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+title: ST_Relate
+description: Returns the DE-9IM intersection matrix string for two geometries.
+kernels:
+  - returns: string
+    args: [geometry, geometry]
+---
+## Description
+Returns the DE-9IM (Dimensionally Extended 9-Intersection Model) intersection matrix
+as a 9-character string describing the spatial relationship between two geometries.
+
+## Examples
+```sql
+SELECT ST_Relate(
+    ST_GeomFromWKT('POINT(0 0)'),
+    ST_GeomFromWKT('POINT(1 1)')
+);
+```