Class rename, composer add, phpUnit tests add

Rename the class from ReadEnvFile to DotEnv.
Add everything to a composer json file so it can be published to
composer repository.
Add phpUnit tests for system

vendor/myclabs/deep-copy/src/DeepCopy/Exception/PropertyException.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace DeepCopy\Exception;
+
+use ReflectionException;
+
+class PropertyException extends ReflectionException
+{
+}