added link

mdfaizanahmed786 · mdfaizanahmed786 · commit e91fa871c4b9 · 2023-06-08T20:19:45.000+05:30
diff --git a/Miscellaneous/CheckIfStraightLine.txt b/Miscellaneous/CheckIfStraightLine.txt
@@ -1,6 +1,6 @@
 You are given an array coordinates, coordinates[i] = [x, y], where [x, y] represents the coordinate of a point. Check if these points make a straight line in the XY plane.
 
- 
+ https://leetcode.com/problems/check-if-it-is-a-straight-line/description/
 
 class Solution {
 public:
