Add section on Auth0
Add section on Auth0

Removed small section mentioning that auth0 uses base64 encoded secrets. It doesn't anymore.

Signed-off-by: Thibault Charbonnier <3c2e9133e272cb489e2fea0c4328cf56b08e4226@me.com>

Mashape/getkong.org,Mashape/getkong.org,Mashape/getkong.org