Update0055.跳跃游戏，添加C#

problems/0055.跳跃游戏.md

@@ -258,6 +258,23 @@ object Solution {
   }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public bool CanJump(int[] nums)
+    {
+        int cover = 0;
+        if (nums.Length == 1) return true;
+        for (int i = 0; i <= cover; i++)
+        {
+            cover = Math.Max(i + nums[i], cover);
+            if (cover >= nums.Length - 1) return true;
+        }
+        return false;
+    }
+}
+```
 
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