added support for phpunit

recipes/phpunit/phpunit/manifest.json

@@ -0,0 +1,5 @@
+{
+    "copy-from-recipe": {
+        "phpunit.xml.dist": "phpunit.xml.dist"
+    }
+}

recipes/phpunit/phpunit/phpunit.xml.dist

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.8/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="vendor/autoload.php"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+        <server name="KERNEL_DIR" value="etc/" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Project Test Suite">
+            <directory>tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>