添加（0045.跳跃游戏II.md）：增加typescript版本

problems/0045.跳跃游戏II.md

@@ -250,6 +250,27 @@ var jump = function(nums) {
 };
 ```
 
+### TypeScript
+
+```typescript
+function jump(nums: number[]): number {
+    const length: number = nums.length;
+    let curFarthestIndex: number = 0,
+        nextFarthestIndex: number = 0;
+    let curIndex: number = 0;
+    let stepNum: number = 0;
+    while (curIndex < length - 1) {
+        nextFarthestIndex = Math.max(nextFarthestIndex, curIndex + nums[curIndex]);
+        if (curIndex === curFarthestIndex) {
+            curFarthestIndex = nextFarthestIndex;
+            stepNum++;
+        }
+        curIndex++;
+    }
+    return stepNum;
+};
+```
+