Added MultiStreamChannel to handle multiple endpoints

tests/Interop/Channel/MultiStreamChannelTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace NoccyLabs\Ipc\Interop\Channel;
+
+
+
+class MultiStreamChannelTest extends \PhpUnit\Framework\TestCase
+{
+
+    public function testCreatingMultipleClients()
+    {
+        $master = new MultiStreamChannel();
+
+        $client1 = $master->createClient();
+        $client2 = $master->createClient();
+        $client3 = $master->createClient();
+
+        $master->send("Hello World");
+
+        $this->assertEquals("Hello World", $client1->receive());
+        $this->assertEquals("Hello World", $client2->receive());
+        $this->assertEquals("Hello World", $client3->receive());
+
+    }
+
+    public function testReadingFromMultipleClients()
+    {
+        $master = new MultiStreamChannel();
+
+        $client1 = $master->createClient();
+        $client2 = $master->createClient();
+        $client3 = $master->createClient();
+
+        $client1->send("a");
+        $client2->send("b");
+        $client3->send("c");
+
+        $this->assertEquals("a", $master->receive());
+        $this->assertEquals("b", $master->receive());
+        $this->assertEquals("c", $master->receive());
+
+    }
+
+}