add site to view and upload files

Reviewed-on: sites/file-explorer#4

assets/controllers/upload_file_controller.js

@@ -0,0 +1,10 @@
+import { Controller } from '@hotwired/stimulus';
+
+export default class extends Controller {
+    connect() {
+        console.log(this.element);
+        this.element.querySelector('input').addEventListener('change', () => {
+            this.element.querySelector('button[type="submit"]').click();
+        });
+    }
+}