chore: add package level comments

solutions/20/q2011/solution.go

@@ -1,3 +1,4 @@
+// Package q2011 implements a solution for https://leetcode.com/problems/final-value-of-variable-after-performing-operations/
 package q2011
 
 func finalValueAfterOperations(operations []string) int {

solutions/20/q2073/solution.go

@@ -1,3 +1,4 @@
+// Package q2073 implements a solution for https://leetcode.com/problems/time-needed-to-buy-tickets/
 package q2073
 
 func timeRequiredToBuy(tickets []int, k int) int {

solutions/20/q2095/solution.go

@@ -1,3 +1,4 @@
+// Package q2095 implements a solution for https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/
 package q2095
 
 type ListNode struct {