Adding validation messages and preventing negative input from user

Author: KayanatSuleman

Sprint-3/alarmclock/index.html

@@ -10,7 +10,7 @@
     <div class="centre">
       <h1 id="timeRemaining">Time Remaining: 00:00</h1>
       <label for="alarmSet">Set time to:</label>
-      <input id="alarmSet" type="number" />
+      <input id="alarmSet" type="number" min="1" step="1"/>
 
       <button id="set" type="button">Set Alarm</button>
       <button id="stop" type="button">Stop Alarm</button>