Add MyTimer.java. This is a simple timer.

src/main/java/MyTimer.java

@@ -0,0 +1,26 @@
+public class MyTimer {
+    private long startTime = 0;
+    private long endTime = 0;
+
+    public MyTimer() {
+        this.start();
+    }
+
+    public void start() {
+        this.startTime = System.currentTimeMillis();
+    }
+
+    public void stop() {
+        this.endTime = System.currentTimeMillis();
+    }
+
+    public long getMillisecond() {
+        return this.endTime - this.startTime;
+    }
+
+    public long getSecond() {
+        return (this.endTime - this.startTime)/1000;
+    }
+
+}
+