Update README.md

Author: itzwow

event_scheduler/README.md

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 ### Screen After events are added: 
 ![h3](https://user-images.githubusercontent.com/84179065/208622423-32439e56-a397-4875-ae52-387902087622.JPG)
 
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+## Demo Video:
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+https://user-images.githubusercontent.com/84179065/208625229-4e0b70e9-5faa-4c58-9b7c-51bdb1a323f4.mp4
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 ## Getting Started
 
 This project is a starting point for a Flutter application.