chore: add package level comments

solutions/8/q812/solution.go

@@ -1,3 +1,4 @@
+// Package q812 implements a solution for https://leetcode.com/problems/largest-triangle-area/
 package q812
 
 func area2(a, b []int) float64 {

solutions/8/q840/solution.go

@@ -1,3 +1,4 @@
+// Package q840 implements a solution for https://leetcode.com/problems/magic-squares-in-grid/
 package q840
 
 func checkSquare(x, y int, grid [][]int) bool {

solutions/8/q841/solution.go

@@ -1,3 +1,4 @@
+// Package q841 implements a solution for https://leetcode.com/problems/keys-and-rooms/
 package q841
 
 func canVisitAllRooms(rooms [][]int) bool {

solutions/8/q865/solution.go

@@ -1,3 +1,4 @@
+// Package q865 implements a solution for https://leetcode.com/problems/smallest-subtree-with-all-the-deepest-nodes/
 package q865
 
 type TreeNode struct {

solutions/8/q872/solution.go

@@ -1,3 +1,4 @@
+// Package q872 implements a solution for https://leetcode.com/problems/leaf-similar-trees/
 package q872
 
 import "slices"

solutions/8/q875/solution.go

@@ -1,3 +1,4 @@
+// Package q875 implements a solution for https://leetcode.com/problems/koko-eating-bananas/
 package q875
 
 import (