Wstg: Add Self DOM-Based Cross-Site Scripting Testing

[victoriadrake]

What would you like added?

Add an article for Self DOM-Based Cross-Site Scripting Testing and ensure it meets the article standards.

Refer to: https://hackerone.com/reports/406587

[JulienRouse]

@victoriadrake the link for article standard goes to a 404, do you mean to link to this page https://github.com/OWASP/wstg/blob/master/template/999.2_Template_Explanation_WSTG-FOO-002.md?

[kingthorin]

Yes and fixed :+1:

[DomKoe]

I would like to be assigned to this.

[github-actions[bot]]

Please comment if you are still working on this issue, as it has been inactive for 30 days. To give everyone a chance to contribute, we are releasing it to new contributors.