added this question

mdfaizanahmed786 · mdfaizanahmed786 · commit b7400f28765a · 2023-06-09T14:02:52.000+05:30
diff --git a/Miscellaneous/CheckNDoubleExisits.txt b/Miscellaneous/CheckNDoubleExisits.txt
@@ -0,0 +1 @@
+https://leetcode.com/problems/check-if-n-and-its-double-exist/description/

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+https://leetcode.com/problems/check-if-n-and-its-double-exist/description/`