Add documentation for suggest anomaly detector feature (#1)

Signed-off-by: gaobinlong <gbinlong@amazon.com>

_dashboards/dashboards-assistant/suggest-anomaly-detector.md

@@ -0,0 +1,67 @@
+---
+layout: default
+title: Suggest Anomaly Detector
+parent: OpenSearch Assistant for OpenSearch Dashboards
+nav_order: 1
+has_children: false
+---
+
+# Suggest Anomaly Detector
+**Experimental**
+{: .label .label-purple }
+
+The OpenSearch-Dashboards Assistant suggest anomaly detector feature helps you create anomaly detector based on the suggestion given by LLM.
+
+## Configuration
+
+### Prerequisites
+1. Please note that you only need to setup `os_suggest_ad` agent for suggest anomaly detector feature, follow this [guide](http://localhost:4000/docs/latest/dashboards/dashboards-assistant/index/#configuring-opensearch-assistant) to setup `os_suggest_ad` agent.
+2. Ensure query enhancements feature is enabled, you can goto `Dashboards Management`>`Advanced settings` to enable this feature.
+
+### Enable Suggest Anomaly Detector
+```yaml
+assistant.smartAnomalyDetector.enabled: true
+```
+{% include copy.html %}
+
+### Create agents with OpenSearch flow-framework 
+Use OpenSearch flow-framework to create the required agents. Please follow [flow-framework documentation](https://github.com/opensearch-project/flow-framework) to create the agents.
+You can start with the flow-framework example template for suggest anomaly detector, see the example template [here](https://github.com/opensearch-project/flow-framework/tree/main/sample-templates).
+
+### Configure agents
+Configure agent for suggest anomaly detector
+```
+POST /.plugins-ml-config/_doc/os_suggest_ad
+{
+  "type": "suggest_anomaly_detector_agent",
+  "configuration": {
+    "agent_id": "your agent id of suggest anomaly detector"
+  }
+}
+```
+{% include copy-curl.html %}
+
+### Verify
+You can verify if the agents were create successfully by call the agents with example payload
+```
+POST /_plugins/_ml/agents/<your agent id>/_execute
+{
+  "parameters": {
+    "index":"sample_weblogs_test"
+  }
+}
+```
+{% include copy-curl.html %}
+
+## Suggest Anomaly Detector UI
+
+Select an index pattern, click the `AI assistant` button and then click the `Suggest anomaly detector` action:
+
+<img width="700" src="{{site.url}}{{site.baseurl}}/images/dashboards-assistant/suggestAD-button.png" alt="Click the Suggest anomaly detector action">
+
+Wait LLM to give the suggested model features and category field for creating anomaly detector for the index pattern, then click the `Create detector` button to create an anomaly detector.
+
+<img width="700" src="{{site.url}}{{site.baseurl}}/images/dashboards-assistant/suggestAD-UI.png" alt="Suggested anomaly detector">
+
+
+