FEATURE #1442: add uploaded file detail

This commit adds functionality for editing keywords and description of selected file. This commit also includes JS library for syntax highlighting (https://highlighjs.org)

app/Http/Requests/EditUploadedFileRequest.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Http\Requests;
+
+class EditUploadedFileRequest extends Request
+{
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array
+     */
+    public function rules()
+    {
+        return [
+            'keywords' => 'max:255'
+        ];
+    }
+}