feat: add ts solution to lc problem: No.476 (doocs#2757)

Author: cblh

solution/0400-0499/0476.Number Complement/README.md

@@ -147,6 +147,12 @@ public:
 };
 ```
 
+```ts
+function findComplement(num: number): number {
+    return num ^ (2 ** num.toString(2).length - 1);
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

solution/0400-0499/0476.Number Complement/README_EN.md

@@ -139,6 +139,12 @@ public:
 };
 ```
 
+```ts
+function findComplement(num: number): number {
+    return num ^ (2 ** num.toString(2).length - 1);
+}
+```
+
 <!-- tabs:end -->
 
 <!-- end -->

solution/0400-0499/0476.Number Complement/Solution2.ts

@@ -0,0 +1,3 @@
+function findComplement(num: number): number {
+    return num ^ (2 ** num.toString(2).length - 1);
+}