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Added problem statement and time complexity

Author: TanyaKhandelwal

src/_Problems_/index.js

@@ -1,3 +1,9 @@
+// FIND BALANCED PARENTHESIS
+// FOR '[{()}]' ---->>>>  BALANCED
+// FOR '[{()]' ---->>>>  UNBALANCED
+// Time complexity : O(n)  n is the length of the string provided.
+
+
 function parentheses(s) {
     if(typeof s !== "string" || s.length % 2 !== 0) return false;
     let i = 0;