Social Auth should provide configuration options to allow site builders manage the behavior of the site in some circumstances. We should be able to provide settings options similar to the ones of Simple FB Connect
This issue covers only the creation of the options in the form. There's no need to make the options work because that will be done in this issue
Create a form class which extends ConfigBaseForm. This form class will be extended by the implementers, so this class should render the setting fields in the buildForm() method.