Add Go codes to docs, including

the chapter of stack and queue, the chapter of tree.

docs/chapter_tree/binary_search_tree.md

@@ -88,7 +88,25 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 查找结点 */
+    func (bst *BinarySearchTree) Search(num int) *TreeNode {
+        node := bst.root
+        // 循环查找，越过叶结点后跳出
+        for node != nil {
+            if node.Val < num {
+                // 目标结点在 root 的右子树中
+                node = node.Right
+            } else if node.Val > num {
+                // 目标结点在 root 的左子树中
+                node = node.Left
+            } else {
+                // 找到目标结点，跳出循环
+                break
+            }
+        }
+        // 返回目标结点
+        return node
+    }
     ```
 
 === "JavaScript"
@@ -187,7 +205,36 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 插入结点 */
+    func (bst *BinarySearchTree) Insert(num int) *TreeNode {
+        cur := bst.root
+        // 若树为空，直接提前返回
+        if cur == nil {
+            return nil
+        }
+        // 待插入结点之前的结点位置
+        var prev *TreeNode = nil
+        // 循环查找，越过叶结点后跳出
+        for cur != nil {
+            if cur.Val == num {
+                return nil
+            }
+            prev = cur
+            if cur.Val < num {
+                cur = cur.Right
+            } else {
+                cur = cur.Left
+            }
+        }
+        // 插入结点
+        node := NewTreeNode(num)
+        if prev.Val < num {
+            prev.Right = node
+        } else {
+            prev.Left = node
+        }
+        return cur
+    }
     ```
 
 === "JavaScript"
@@ -365,7 +412,60 @@ comments: true
 === "Go"
 
     ```go title="binary_search_tree.go"
-
+    /* 删除结点 */
+    func (bst *BinarySearchTree) Remove(num int) *TreeNode {
+        cur := bst.root
+        // 若树为空，直接提前返回
+        if cur == nil {
+            return nil
+        }
+        // 待删除结点之前的结点位置
+        var prev *TreeNode = nil
+        // 循环查找，越过叶结点后跳出
+        for cur != nil {
+            if cur.Val == num {
+                break
+            }
+            prev = cur
+            if cur.Val < num {
+                // 待删除结点在右子树中
+                cur = cur.Right
+            } else {
+                // 待删除结点在左子树中
+                cur = cur.Left
+            }
+        }
+        // 若无待删除结点，则直接返回
+        if cur == nil {
+            return nil
+        }
+        // 子结点数为 0 或 1
+        if cur.Left == nil || cur.Right == nil {
+            var child *TreeNode = nil
+            // 取出待删除结点的子结点
+            if cur.Left != nil {
+                child = cur.Left
+            } else {
+                child = cur.Right
+            }
+            // 将子结点替换为待删除结点
+            if prev.Left == cur {
+                prev.Left = child
+            } else {
+                prev.Right = child
+            }
+            // 子结点数为 2
+        } else {
+            // 获取中序遍历中待删除结点 cur 的下一个结点
+            next := bst.GetInorderNext(cur)
+            temp := next.Val
+            // 递归删除结点 next
+            bst.Remove(next.Val)
+            // 将 next 的值复制给 cur
+            cur.Val = temp
+        }
+        return cur
+    }
     ```
 
 === "JavaScript"