Add an FAQ about where to store the global plugin configuration
Add an FAQ about where to store the global plugin configuration

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I8e8c39c1f51c401ac88c53a90aaaa40ba4745069

GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners