Conference Video Call System A company need to create a local conference video call system to facilitate the communication between its employees across the world. The requirements are: ·  The admin shall be able to add new users to the system. ·  The admin shall be able to remove users from the system. ·  The user shall have a contact-list containing other users. ·  The user shall be able to add other users to his contact list. ·  The user shall be able to schedule a conference video call. ·  The user shall be able to invite other users from his contact list to his conference video call.  ·  The user shall be able to accept/reject a conference video call  ·  The user shall be able to join conference video call that they were invited to. ·  The user shall be able to send chat messages in the conference video call chat. ·  The system shall notify the user when an accepted conference video call time is close. ·  The system shall notify the user when another user accepts/rejects their invite. Assignment1: Design a block diagram for the system. Assignment2: Design a Database schema for the system.  Note: assume any missing requirement Please write it as doc and make it simple design.  This is not coding assignment , just thinking written in design.