Add stream examples. (#1830)

* Adds stream consumer and producer scripts to doc.

* Updated build command example.

* Adds stream producer example.

* Adds basic stream consumer example.

* Added isolated execution.

* Update README.md

* Update stream-consumer.js

Co-authored-by: Leibale Eidelman <leibale1998@gmail.com>

examples/stream-producer.js

@@ -0,0 +1,28 @@
+// A sample stream producer using XADD.
+
+import { createClient } from 'redis';
+
+async function streamProducer() {
+  const client = createClient();
+
+  await client.connect();
+  await client.del('mystream');
+
+  let num = 0;
+
+  while (num < 1000) {
+    // * = Let Redis generate a timestamp ID for this new entry.
+    let id = await client.xAdd('mystream', '*', {
+      num: `${num}`
+      // Other name/value pairs can go here as required...
+    });
+
+    console.log(`Added ${id} to the stream.`);
+    num += 1;
+  }
+
+  await client.quit();
+}
+
+streamProducer();
+