Update README.md

Author: ZahraErfani

README.md

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 ToDo App using Flutter implemented with Hive DataBase
 
-<img alt="Screenshot_20230419_124609" height="1080" src="https://user-images.githubusercontent.com/48985551/233029021-6d27c021-2e0f-4161-b32a-93985664e8fc.png" width="540"/>
-
-![Screenshot_20230419_124054](https://user-images.githubusercontent.com/48985551/233029065-9fb1f7a2-64a4-4f13-9dfd-823b5ad19b11.png)
-![Screenshot_20230419_124107](https://user-images.githubusercontent.com/48985551/233029073-957e38b7-8d80-4260-b701-64b01b2a3d66.png)
-![Screenshot_20230419_124638](https://user-images.githubusercontent.com/48985551/233029098-87319a78-0fe3-491f-9f14-766b0bf2d3c2.png)
+<img alt="Screenshot_20230419_124609" height="540" src="https://user-images.githubusercontent.com/48985551/233029021-6d27c021-2e0f-4161-b32a-93985664e8fc.png" width="270"/>
+<img alt="Screenshot_20230419_124054" height="540" src="https://user-images.githubusercontent.com/48985551/233029065-9fb1f7a2-64a4-4f13-9dfd-823b5ad19b11.png" width="270"/>
+<img alt="Screenshot_20230419_124107" height="540" src="https://user-images.githubusercontent.com/48985551/233029073-957e38b7-8d80-4260-b701-64b01b2a3d66.png" width="270"/>
+<img alt="Screenshot_20230419_124638" height="540" src="https://user-images.githubusercontent.com/48985551/233029098-87319a78-0fe3-491f-9f14-766b0bf2d3c2.png" width="270"/>