Update README.md

README.md

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 * **Main objective**
 
      1. Creation of Mobile application using python that detect the mood of the user by facial recognition and voice recognition and recommend songs  
-*** Main research questions**
+***** Main research questions****
 1. Is there any ways to solve these problems?
 2. What are the additional requirements for the song recommendation system?
 3. How can the system adapt to changes in the user's facial expressions?