Update README.md

Author: hyeonsieun

README.md

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 A brief explanatory video about this project is available at the following [link](https://www.youtube.com/watch?v=ZQsFbdTFZjo).<br>
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+This project was designed to be primarily executed in the Google Colab environment.
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 ### CelebA-Dialog
 
 Dataset can be downloaded from [here](https://drive.google.com/drive/folders/1HwCTiyUUiN71fATB56Ea8qfUEq-X8AG7?usp=sharing).<br>