chore: add package level comments

solutions/6/q605/solution.go

@@ -1,3 +1,4 @@
+// Package q605 implements a solution for https://leetcode.com/problems/can-place-flowers/
 package q605
 
 func canPlaceFlowers(flowerbed []int, n int) bool {

solutions/6/q636/solution.go

@@ -1,3 +1,4 @@
+// Package q636 implements a solution for https://leetcode.com/problems/exclusive-time-of-functions/
 package q636
 
 import (

solutions/6/q637/solution.go

@@ -1,3 +1,4 @@
+// Package q637 implements a solution for https://leetcode.com/problems/average-of-levels-in-binary-tree/
 package q637
 
 type TreeNode struct {

solutions/6/q643/solution.go

@@ -1,3 +1,4 @@
+// Package q643 implements a solution for https://leetcode.com/problems/maximum-average-subarray-i/
 package q643
 
 import "math"

solutions/6/q645/solution.go

@@ -1,3 +1,4 @@
+// Package q645 implements a solution for https://leetcode.com/problems/set-mismatch/
 package q645
 
 func findErrorNums(nums []int) []int {

solutions/6/q649/solution.go

@@ -1,3 +1,4 @@
+// Package q649 implements a solution for https://leetcode.com/problems/dota2-senate/
 package q649
 
 func predictPartyVictory(senate string) string {

solutions/6/q693/solution.go

@@ -1,3 +1,4 @@
+// Package q693 implements a solution for https://leetcode.com/problems/binary-number-with-alternating-bits/
 package q693
 
 func hasAlternatingBits(n int) bool {

solutions/6/q696/solution.go

@@ -1,3 +1,4 @@
+// Package q696 implements a solution for https://leetcode.com/problems/count-binary-substrings/
 package q696
 
 func countBinarySubstrings(s string) int {