Merge pull request #1029 from xiaofei-2020/str3

添加（剑指Offer05.替换空格.md）：增加typescript版本

problems/剑指Offer05.替换空格.md

@@ -298,6 +298,33 @@ javaScript:
 };
 ```
 
+TypeScript：
+
+```typescript
+function replaceSpace(s: string): string {
+    let arr: string[] = s.split('');
+    let spaceNum: number = 0;
+    let oldLength: number = arr.length;
+    for (let i = 0; i < oldLength; i++) {
+        if (arr[i] === ' ') {
+            spaceNum++;
+        }
+    }
+    arr.length = oldLength + 2 * spaceNum;
+    let cur: number = oldLength - 1;
+    for (let i = arr.length - 1; i >= 0; i--, cur--) {
+        if (arr[cur] !== ' ') {
+            arr[i] = arr[cur]
+        } else {
+            arr[i] = '0';
+            arr[--i] = '2';
+            arr[--i] = '%';
+        }
+    }
+    return arr.join('');
+};
+```
+
 Swift:
 
 ```swift