Added getInput() method for basic async input

examples/input.php

@@ -0,0 +1,31 @@
+<?php
+/*
+ *  This example demonstrates how to use events to catch commands that
+ *  have not been handled by any context or builtin.
+ *
+ */
+
+require_once __DIR__."/../vendor/autoload.php";
+
+use NoccyLabs\Shell\Shell;
+use NoccyLabs\Shell\Style;
+use NoccyLabs\Shell\Context;
+
+$myShell = new Shell();
+
+// Set the initial prompt, not really needed.
+$myShell->setPrompt("test>");
+
+// Create an anonymous context and add a command
+$ctx = $myShell->createContext("root");
+$ctx->addCommand("hello", function () use ($myShell) {
+    $myShell->getInput("What is your name?", function ($name) use ($myShell) {
+        echo "Hello, {$name}\n";
+        $myShell->getInput("Who is your daddy and what does he do?", function ($daddy) {
+            echo "{$daddy}? Oookay...\n";
+        });
+    });
+});
+
+// Run the shell
+$myShell->run();