[DOC] Document the usage of CreateAnomalyDetectorTool

[gaobinlong]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.

We'll introduce a new tool named CreateAnomalyDetectorTool in skills plugin, we need to document the usage.

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.16.0

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/skills#348