Update Readme.md

Author: imabhishekkumar

Challenge questions/Readme.md

@@ -42,12 +42,14 @@ Write a program that converts text written numbers (Ex: Thirty-One) to its numer
 ### Challenge 7
 WAP that inputs the length and breadth of a sheet, this sheet should be made of a diamond design with '~' and the rest of the corners should be filled with '#'
 eg- size=7X7
+```
     ###~###
     ##~~~##
     #~~~~~#
     ~~~~~~~
     #~~~~~#
     ##~~~##
     ###~###
+ ```
 ### Challenge 8
 ***Challenge Awaits***