chore: add package level comments

solutions/16/q1653/solution.go

@@ -1,3 +1,4 @@
+// Package q1653 implements a solution for https://leetcode.com/problems/minimum-deletions-to-make-string-balanced/
 package q1653
 
 func minimumDeletions(s string) int {

solutions/16/q1657/solution.go

@@ -1,3 +1,4 @@
+// Package q1657 implements a solution for https://leetcode.com/problems/determine-if-two-strings-are-close/
 package q1657
 
 import "slices"

solutions/16/q1679/solution.go

@@ -1,3 +1,4 @@
+// Package q1679 implements a solution for https://leetcode.com/problems/max-number-of-k-sum-pairs/
 package q1679
 
 import "slices"