add seo-tool's

[Astra5155j]

What's has been added?

seo tool list

Why is it good for SEO?

It is good because at one place user see the tool to help

Checklist

Please make sure all of these three points are in your PR, otherwise the PR will be rejected.

• Details about the addition [?]
• An example about usage [?]
• Description of why it's good for SEO [?]

:warning: If you have made a PR with all of these points, then don't include this section upon creation!