Add readme

README.md

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+ClassFinder
+===========
+
+A lightweight utility to identify classes in a given namespace.  This package is an improved implementation of an
+ [answer on Stack Overflow](https://stackoverflow.com/a/40229665/3000068) that provides additional features with less
+ configuration required.
+
+Requirements
+------------
+
+ * Application is using Composer.
+ * Classes are compliant with PSR-4.
+ * PHP >= 5.3.0
+ 
+Installing
+----------
+
+Installing is done by requiring it with Composer.
+
+```
+$ composer require haydenpierce/class-finder
+```
+
+No other installation methods are currently supported.
+
+Example
+-------
+
+```
+<?php
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+$classes = ClassFinder::getClassesInNamespace('TestApp1\Foo');
+
+/**
+ * array(
+ *   'TestApp1\Foo\Bar',
+ *   'TestApp1\Foo\Baz',
+ *   'TestApp1\Foo\Foo'
+ * )
+ */
+var_dump($classes);
+```
+