Progress made on the compiler, added example library for compiling tests

tests/example_project/src/ExampleLibrary/Exceptions/InvalidNameException.php

@@ -0,0 +1,26 @@
+<?php
+
+    /** @noinspection PhpPropertyOnlyWrittenInspection */
+
+    namespace ExampleLibrary\Exceptions;
+
+    use Exception;
+    use Throwable;
+
+    class InvalidNameException extends Exception
+    {
+        private ?Throwable $previous;
+
+        /**
+         * @param string $message
+         * @param int $code
+         * @param Throwable|null $previous
+         */
+        public function __construct(string $message = "", int $code = 0, ?Throwable $previous = null)
+        {
+            parent::__construct($message, $code, $previous);
+            $this->message = $message;
+            $this->code = $code;
+            $this->previous = $previous;
+        }
+    }