Update README.md

Image size modified.

Author: Indumathi1195R

README.md

@@ -58,7 +58,7 @@ body: Card(
 
 **Screenshots**
 
-<img alt="month" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img1.png" width="250" height="250" />|
-<img alt="year" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img2.png" width="250" height="250" />|
-<img alt="decade" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img3.png" width="250" height="250" />|
-<img alt="century" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img4.png" width="250" height="250" />|
+<img alt="month" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img1.png" width="230" height="400" />|
+<img alt="year" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img2.png" width="230" height="400" />|
+<img alt="decade" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img3.png" width="230" height="400" />|
+<img alt="century" src="http://www.syncfusion.com/uploads/user/kb/flut/flut-852/flut-852_img4.png" width="230" height="400" />|