✨ feat(rust/tree): add binary_tree (#398)

* ✨ feat(rust/hashing): add array_hash_map

* 📃 docs(rust/hashing): correct comments

* ✨ feat(rust/include): add tree_node

* ✨ feat(rust/include): add print_tree

* ✨ feat(rust/tree): add binary_tree

* docs(rust/tree): correct comments

* 📃 docs(rust/tree): correct comments

codes/rust/include/tree_node.rs

@@ -0,0 +1,29 @@
+/**
+ * File: tree_node.rs
+ * Created Time: 2023-02-27
+ * Author: xBLACKICEx (xBLACKICE@outlook.com)
+ */
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+#[allow(dead_code)]
+pub struct TreeNode {
+    pub val: i32,
+    pub high: i32,
+    pub parent: Option<Rc<RefCell<TreeNode>>>,
+    pub left: Option<Rc<RefCell<TreeNode>>>,
+    pub right: Option<Rc<RefCell<TreeNode>>>,
+}
+
+impl TreeNode {
+    pub fn new(val: i32) -> Rc<RefCell<Self>> {
+        Rc::new(RefCell::new(Self {
+            val,
+            high: 0,
+            parent: None,
+            left: None,
+            right: None
+        }))
+    }
+}