feat: add typescript solution to lc problem: No.0342.Power of Four (doocs#429)

Author: zhaocchen

solution/0300-0399/0342.Power of Four/README.md

@@ -109,6 +109,14 @@ func isPowerOfFour(n int) bool {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function isPowerOfFour(n: number): boolean {
+    return n > 0 && (n & (n - 1)) == 0 && (n & 0xaaaaaaaa) == 0;
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0342.Power of Four/README_EN.md

@@ -82,6 +82,14 @@ func isPowerOfFour(n int) bool {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function isPowerOfFour(n: number): boolean {
+    return n > 0 && (n & (n - 1)) == 0 && (n & 0xaaaaaaaa) == 0;
+};
+```
+
 ### **...**
 
 ```

solution/0300-0399/0342.Power of Four/Solution.ts

@@ -0,0 +1,3 @@
+function isPowerOfFour(n: number): boolean {
+    return n > 0 && (n & (n - 1)) == 0 && (n & 0xaaaaaaaa) == 0;
+};