Added readme

README.md

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+# Installation
+Require the repo via `composer require nateageek/robo-phplint`
+# Usage
+```php
+<?php
+
+class RoboFile extends \Robo\Tasks {
+
+  use NateAGeek\Robo\Task\PHPLint\Tasks;
+
+  function testLint() {
+    //This will run phplint on all *.php files in the directory /phplint-code 
+   // Also will return any errors found as an array.
+    $this->taskPHPLintTask("/phplint-code")
+      ->run();
+  }
+}
+```