Update QUICKSTART.md to reflect removed consume() API

Author: milindl

QUICKSTART.md

@@ -1,7 +1,7 @@
 # Basic Producer Example
 
 ```javascript
-const { Kafka } = require('../..').KafkaJS
+const { Kafka } = require('@confluentinc/kafka-javascript').KafkaJS;
 
 async function producerStart() {
     const producer = new Kafka().producer({
@@ -27,38 +27,40 @@ producerStart();
 # Basic Consumer Example
 
 ```javascript
-const { Kafka } = require('../..').KafkaJS
+const { Kafka } = require('@confluentinc/kafka-javascript').KafkaJS;
 
 async function consumerStart() {
-  const consumer = new Kafka().consumer({
+  let consumer;
+  let stopped = false;
+
+  // Initialization
+  consumer = new Kafka().consumer({
     'bootstrap.servers': '<fill>',
     'group.id': 'test',
     'auto.offset.reset': 'earliest',
   });
 
   await consumer.connect();
-
-  await consumer.subscribe({ topics: [ "topic" ] });
-
-  let stopped = false;
-  while (!stopped) {
-    const message = await consumer.consume(1000);
-    if (!message) {
-      continue;
+  await consumer.subscribe({ topics: ["topic"] });
+
+  consumer.run({
+    eachMessage: async ({ topic, partition, message }) => {
+      console.log({
+        topic,
+        partition,
+        offset: message.offset,
+        key: message.key?.toString(),
+        value: message.value.toString(),
+      });
     }
-    console.log({
-      topic: message.topic,
-      partition: message.partition,
-      offset: message.offset,
-      key: message.key?.toString(),
-      value: message.value.toString(),
-    });
+  });
 
-    // Update stopped whenever we're done consuming.
-    // stopped = true;
+  // Update stopped whenever we're done consuming.
+  // The update can be in another async function or scheduled with setTimeout etc.
+  while(!stopped) {
+    await new Promise(resolve => setTimeout(resolve, 1000));
   }
 
-  // Disconnect and clean up.
   await consumer.disconnect();
 }