Merge pull request #1046 from xiaofei-2020/stack2

添加（0232.用栈实现队列.md）：增加typescript版本

problems/0232.用栈实现队列.md

@@ -348,7 +348,44 @@ MyQueue.prototype.empty = function() {
 };
  ```
 
+TypeScript:
+
+```typescript
+class MyQueue {
+    private stackIn: number[]
+    private stackOut: number[]
+    constructor() {
+        this.stackIn = [];
+        this.stackOut = [];
+    }
+
+    push(x: number): void {
+        this.stackIn.push(x);
+    }
+
+    pop(): number {
+        if (this.stackOut.length === 0) {
+            while (this.stackIn.length > 0) {
+                this.stackOut.push(this.stackIn.pop()!);
+            }
+        }
+        return this.stackOut.pop()!;
+    }
+
+    peek(): number {
+        let temp: number = this.pop();
+        this.stackOut.push(temp);
+        return temp;
+    }
+
+    empty(): boolean {
+        return this.stackIn.length === 0 && this.stackOut.length === 0;
+    }
+}
+```
+
 Swift：
+
 ```swift
 class MyQueue {