go: add «2206. Divide Array Into Equal Pairs»

URL:	https://leetcode.com/problems/divide-array-into-equal-pairs/
Signed-off-by: Matej Focko <me@mfocko.xyz>

go/divide-array-into-equal-pairs.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	hs "github.com/emirpasic/gods/v2/sets/hashset"
+)
+
+func divideArray(nums []int) bool {
+	seen := hs.New[int]()
+
+	for _, x := range nums {
+		if seen.Contains(x) {
+			seen.Remove(x)
+		} else {
+			seen.Add(x)
+		}
+	}
+
+	return seen.Empty()
+}