doc: add release notes for 2.19 (#426)

Signed-off-by: tygao <[email protected]>

release-notes/dashboards-assistant.release-notes-2.19.0.0.md

@@ -0,0 +1,26 @@
+## Version 2.19.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.19.0
+
+### Features
+
+- feat: only support visual editor alerts to navigate to discover([#368](https://github.com/opensearch-project/dashboards-assistant/pull/368))
+- feat: return 404 instead of 500 for missing agent config name([#384](https://github.com/opensearch-project/dashboards-assistant/pull/384))
+- feat: Update UI for In-context summarization in Alerts table([#392](https://github.com/opensearch-project/dashboards-assistant/pull/392))
+- feat: Hide "stop generation" and regenerate button based on feature flag([#394](https://github.com/opensearch-project/dashboards-assistant/pull/394))
+- feat: Chatbot entry UI redesign([#396](https://github.com/opensearch-project/dashboards-assistant/pull/396))
+- feat: Set logo config in assistant and read logo by config([#401](https://github.com/opensearch-project/dashboards-assistant/pull/401))
+- feat: Update dropdown list button label and remove popover title([#407](https://github.com/opensearch-project/dashboards-assistant/pull/407))
+- feat: Use feature flag to disable the delete conversation api([#409](https://github.com/opensearch-project/dashboards-assistant/pull/409))
+- feat: Disable the rename conversation api using feature flag([#410](https://github.com/opensearch-project/dashboards-assistant/pull/410))
+
+### Maintenance
+
+- Increment version to 2.19.0.0([#375](https://github.com/opensearch-project/dashboards-assistant/pull/375))
+- Bump cross-spawn from 6.0.5 and 7.0.3 to 7.0.5([#418](https://github.com/opensearch-project/dashboards-assistant/pull/418))
+- Bump cross-spawn from 7.0.3 to 7.0.5([#421](https://github.com/opensearch-project/dashboards-assistant/pull/421))
+
+### Fixes
+
+- fix: Fix returns 500 error for AI agent APIs when OpenSearch returns 4xx error with json format error message([#380](https://github.com/opensearch-project/dashboards-assistant/pull/380))
+- fix: Fix chatbot flyout not show after re-mount([#399](https://github.com/opensearch-project/dashboards-assistant/pull/399))