Update relay-sms.protected.js with comments

masked-number/functions/relay-sms.protected.js

@@ -1,3 +1,29 @@
+/*
+ * Masking your phone number for SMS Forwarding and Responding
+ *
+ * Description:
+ * This function acts as a message-forwarding service 
+ * If the message comes from the user, it forwards the message to another number. 
+ * If it comes from someone else, it forwards it to the user.
+ *
+ * Contents:
+ * 1. Initialize Client and Response
+ * 2. Sender Check
+ * 3. Extracting Recipient and Message
+ * 4. Sending the Message
+ * 5. Handling Messages from Other Senders
+ */
+
+/*
+ * 1. Initialize client and response 
+ *
+ * Here you can initialize a Twilio client (client) to interact with Twilio's API.
+ *
+ * A twiml object is created to generate TwiML (Twilio Markup Language) responses, 
+ * which are instructions that tell Twilio how to respond to an incoming message.
+ */
+
+// Defines the main function handler for the Twilio Function.
 exports.handler = async function (context, event, callback) {
   const client = context.getTwilioClient();
   const twiml = new Twilio.twiml.MessagingResponse();