MXS-1779 Add REST-API documentation

Documentation/REST-API/Resources-MaxScale.md

@@ -575,3 +575,41 @@ contain any valid JSON value.
 Command with no output:
 
 `Status: 204 No Content`
+
+## Classify a statement
+
+```
+GET /v1/maxscale/query_classifier/classify?sql=<statement>
+```
+
+Classify provided statement and return the result.
+
+#### Response
+
+`Status: 200 OK`
+
+```
+GET /v1/maxscale/query_classifier/classify?sql=SELECT+1
+```
+
+```javascript
+{
+    "links": {
+        "self": "http://localhost:8989/v1/maxscale/query_classifier/classify"
+    },
+    "data": {
+        "id": "classify",
+        "type": "classify",
+        "attributes": {
+            "parameters": {
+                "parse_result": "QC_QUERY_PARSED",
+                "type_mask": "QUERY_TYPE_READ",
+                "operation": "QUERY_OP_SELECT",
+                "has_where_clause": false,
+                "fields": [],
+                "functions": []
+            }
+        }
+    }
+}
+```