Add ru version (#1865)

* Add Russian docs site baseline

* Add Russian localized codebase

* Polish Russian code wording

* Update ru code translation.

* Update code translation and chapter covers.

* Fix pythontutor extraction.

* Add README and landing page.

* placeholder of profiles

* Use figures of English version

* Remove chapter paperbook

ru/codes/go/pkg/tree_node_test.go

@@ -0,0 +1,21 @@
+// File: tree_node_test.go
+// Created Time: 2022-11-25
+// Author: Reanon (793584285@qq.com)
+
+package pkg
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestTreeNode(t *testing.T) {
+	arr := []any{1, 2, 3, nil, 5, 6, nil}
+	node := SliceToTree(arr)
+
+	// print tree
+	PrintTree(node)
+
+	// tree to arr
+	fmt.Println(TreeToSlice(node))
+}