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/nikic/php-parser/lib/PhpParser/Node/VarLikeIdentifier.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node;
+
+/**
+ * Represents a name that is written in source code with a leading dollar,
+ * but is not a proper variable. The leading dollar is not stored as part of the name.
+ *
+ * Examples: Names in property declarations are formatted as variables. Names in static property
+ * lookups are also formatted as variables.
+ */
+class VarLikeIdentifier extends Identifier
+{
+    public function getType() : string {
+        return 'VarLikeIdentifier';
+    }
+}