added some info about scan

Author: ujjwal-kr

client/index.html

@@ -60,6 +60,17 @@ <h1>EPIC_Tracker</h1>
             you. Doing this with a browser requires permissions, but I have skipped it due to security reasons.
         </code>
 
+        <br><br><br>
+        <h3>Opt In for a scan?</h3>
+        <code>
+            Open this website with any other devices from the same network, i.e connected to same wifi, and press the
+            "OPT IN FOR SCAN" button. Then press the "SCAN" button from this device. You should see the information of
+            all the devices which has opted in for scan in last 30 minutes.
+            <br><br>
+            This demo shows that all the devices from your network can be identified on the basis of IPs and the
+            metadata can be collected.
+        </code>
+
         <button class="optIn">OPT</button>
         <br>
         <button class="scanButton">SCAN</button>