Add OAuth Testing (OTG-AUTHN)

[victoriadrake]

What would you like added?
Add an article on testing Oauth. Ensure it follows the article standard.

[DomKoe]

@victoriadrake link is broken, so I leave this one here, I believe it is the correct one atm.
https://github.com/OWASP/wstg/blob/master/template/999.2_Template_Explanation_WSTG-FOO-002.md

[kingthorin]

Fixed. Tickets were opened before the OTG > WSTG change

[ThunderSon]

Thanks to @garethventon, provided me with the following link to identify prevention mechanisms. This link can help us write out the tests for this testing scenario:
Facebook OAuth Framework Vulnerability

[hazanasec]

I'm happy to begin some work on this

[kingthorin]

@hazanasec are you going to be able to tackle this?

[hazanasec]

@kingthorin I'm about half way through, was slowed down by personal things

[kingthorin]

No worries, was just checking in. Life happens 👍

[github-actions]

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.