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.