feat(go): support basic pkg

codes/go/pkg/tree_node_test.go

@@ -0,0 +1,15 @@
+// File: tree_node_test.go
+// Created Time: 2022-11-25
+// Author: Reanon (793584285@qq.com)
+
+package pkg
+
+import "testing"
+
+func TestTreeNode(t *testing.T) {
+	arr := []int{2, 3, 5, 6, 7}
+	node := ArrayToTree(arr)
+
+	// print tree
+	PrintTree(node)
+}