添加（0053.最大子序和动态规划.md）：增加typescript版本

Author: xiaofei-2020

problems/0053.最大子序和（动态规划）.md

@@ -186,6 +186,24 @@ const maxSubArray = nums => {
 };
 ```
 
+TypeScript：
+
+```typescript
+function maxSubArray(nums: number[]): number {
+    /**
+        dp[i]：以nums[i]结尾的最大和
+     */
+    const dp: number[] = []
+    dp[0] = nums[0];
+    let resMax: number = 0;
+    for (let i = 1; i < nums.length; i++) {
+        dp[i] = Math.max(dp[i - 1] + nums[i], nums[i]);
+        resMax = Math.max(resMax, dp[i]);
+    }
+    return resMax;
+};
+```
+
 
 
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