added timer

scripts/timer.js

@@ -0,0 +1,19 @@
+var minutesLabel = document.getElementById("minutes");
+var secondsLabel = document.getElementById("seconds");
+var totalSeconds = 0;
+function setTime() {
+    if(!health == 0){
+    ++totalSeconds;
+    secondsLabel.innerHTML = pad(totalSeconds % 60);
+    minutesLabel.innerHTML = pad(parseInt(totalSeconds / 60));
+    }
+  }
+  
+  function pad(val) {
+    var valString = val + "";
+    if (valString.length < 2) {
+      return "0" + valString;
+    } else {
+      return valString;
+    }
+  }