Merge pull request youngyangyang04#1011 from xiaofei-2020/ts3

添加（0059.螺旋矩阵II.md）：增加typescript版本

problems/0059.螺旋矩阵II.md

@@ -287,6 +287,51 @@ var generateMatrix = function(n) {
 
 ```
 
+TypeScript:
+
+```typescript
+function generateMatrix(n: number): number[][] {
+    let loopNum: number = Math.floor(n / 2);
+    const resArr: number[][] = new Array(n).fill(1).map(i => new Array(n));
+    let chunkNum: number = n - 1;
+    let startX: number = 0;
+    let startY: number = 0;
+    let value: number = 1;
+    let x: number, y: number;
+    while (loopNum--) {
+        x = startX;
+        y = startY;
+        while (x < startX + chunkNum) {
+            resArr[y][x] = value;
+            x++;
+            value++;
+        }
+        while (y < startY + chunkNum) {
+            resArr[y][x] = value;
+            y++;
+            value++;
+        }
+        while (x > startX) {
+            resArr[y][x] = value;
+            x--;
+            value++;
+        }
+        while (y > startY) {
+            resArr[y][x] = value;
+            y--;
+            value++;
+        }
+        startX++;
+        startY++;
+        chunkNum -= 2;
+    }
+    if (n % 2 === 1) {
+        resArr[startX][startY] = value;
+    }
+    return resArr;
+};
+```
+
 Go:
 
 ```go