Add initial JavaScript/TypeScript support

Add JS/TS support to `versa install`.

Run `npm install`, `yarn` or `pnpm install` based on which files are
present in the project.

src/Enum/ProjectLanguage.php

@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enum;
+
+enum ProjectLanguage: string
+{
+    case JavaScript = 'javascript';
+    case PHP = 'php';
+}