chore: add package level comments

solutions/35/q3507/solution.go

@@ -1,3 +1,4 @@
+// Package q3507 implements a solution for https://leetcode.com/problems/minimum-pair-removal-to-sort-array-i/
 package q3507
 
 import "math"

solutions/35/q3510/solution.go

@@ -1,3 +1,4 @@
+// Package q3510 implements a solution for https://leetcode.com/problems/minimum-pair-removal-to-sort-array-ii/
 package q3510
 
 import "container/heap"

solutions/35/q3512/solution.go

@@ -1,3 +1,4 @@
+// Package q3512 implements a solution for https://leetcode.com/problems/minimum-operations-to-make-array-sum-divisible-by-k/
 package q3512
 
 func minOperations(nums []int, k int) int {

solutions/35/q3516/solution.go

@@ -1,3 +1,4 @@
+// Package q3516 implements a solution for https://leetcode.com/problems/find-closest-person/
 package q3516
 
 func abs(n int) int {

solutions/35/q3541/solution.go

@@ -1,3 +1,4 @@
+// Package q3541 implements a solution for https://leetcode.com/problems/find-most-frequent-vowel-and-consonant/
 package q3541
 
 func maxFreqSum(s string) int {