public <C extends Credentials, U extends CommonProfile> Auth client(
      final Function<Config, Client<C, U>> provider) {
    return client("*", provider);
  }
public <C extends Credentials, U extends CommonProfile> Auth client(
      final Function<Config, Client<C, U>> provider) {
    return client("*", provider);
  }
public < C extends Credentials , U extends CommonProfile > Auth client ( final Function < Config , Client < C , U > > provider ) { return client ( "*" , provider ) ; }
Add an auth client, like facebook, twitter, github, etc...Please note the require dependency
must be in the classpath.

@param provider Client to add.
@param <C> Credentials.
@param <U> CommonProfile.
@return This module.
Add an auth client like facebook twitter github etc ... Please note the require dependency must be in the classpath .