Added base exception

Author: WalterWoshid

src/Exception/CodeTransformerException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Okapi\CodeTransformer\Exception;
+
+use RuntimeException;
+
+/**
+ * # Code Transformer Exception
+ *
+ * Base exception for all Code Transformer exceptions.
+ */
+abstract class CodeTransformerException extends RuntimeException
+{
+}