He recites the soorah after al-Faatihah quietly so that the congregation can recite al-Faatihah
Question

                After reciting al-Faatihah in Jumu’ah (Friday) prayers, the Imaam recites part of the following soorah in a low voice, so that those who believe that it is obligatory for members of the congregation to recite al-Faatihah can do so. Then the imaam recites the rest of the soorah out loud. Is this bid’ah?
Praise be to Allah.We put this question to Shaykh Muhammad ibn Saalih al-‘Uthaymeen, 
          may Allaah preserve him, who answered as follows: 
Yes, this is bid’ah. And Allaah knows best.