docs: update README_EN and README to lc problem: No.1535 (doocs#1929)

Author: dev-mauli

Diff for: solution/1500-1599/1535.Find the Winner of an Array Game/README.md

@@ -175,6 +175,28 @@ function getWinner(arr: number[], k: number): number {
 }
 ```
 
+### **C#**
+
+```cs
+public class Solution {
+    public int GetWinner(int[] arr, int k) {
+        int maxElement = arr[0], count = 0;
+        for (int i = 1; i < arr.Length; i++) {
+            if (maxElement < arr[i]) {
+                maxElement = arr[i];
+                count = 1;
+            } else {
+                count++;
+            }
+            if (count == k) {
+                break;
+            }
+        }
+        return maxElement;
+    }
+}
+```
+
 ### **...**
 
 ```

Diff for: solution/1500-1599/1535.Find the Winner of an Array Game/README_EN.md

@@ -153,6 +153,28 @@ function getWinner(arr: number[], k: number): number {
 }
 ```
 
+### **C#**
+
+```cs
+public class Solution {
+    public int GetWinner(int[] arr, int k) {
+        int maxElement = arr[0], count = 0;
+        for (int i = 1; i < arr.Length; i++) {
+            if (maxElement < arr[i]) {
+                maxElement = arr[i];
+                count = 1;
+            } else {
+                count++;
+            }
+            if (count == k) {
+                break;
+            }
+        }
+        return maxElement;
+    }
+}
+```
+
 ### **...**
 
 ```