Conduct search engine discovery/reconnaissance for information leakage (OTG-INFO-001)

This is a draft of a section of the new Testing Guide v3

Brief Summary
This section describes how to retrieve information about the application being tested from the Google Cache and other Search Engines such as Live, Yahoo!, etc.

Description of the Issue
...here: Short Description of the Issue: Topic and Explanation

Black Box testing and example
Testing for Topic X vulnerabilities: ... Result Expected: ...

Gray Box testing and example
Testing for Topic X vulnerabilities: ... Result Expected: ...