code: @SuppressWarnings({"rawtypes", "unchecked"})
    public <C extends Credentials, U extends CommonProfile> Auth client(final String pattern,
        final Class<? extends Client<C, U>> client) {
      bindings.put(pattern, (binder, config) -> {
  
        Multibinder.newSetBinder(binder, Client.class)
            .addBinding().to(client);
  
        Class profileType = ClientType.typeOf(client);
  
        bindProfile(binder, profileType);
  
        return new AuthFilter(client, profileType);
  
      });
      return this;
    }
docs: Add an auth client, like facebook, twitter, github, etc...Please note the require dependency
  must be in the classpath.
  
  @param pattern URL pattern to protect.
  @param client Client to add.
  @param <C> Credentials.
  @param <U> CommonProfile.
  @return This module.