docs(download): add download button with hubspot form

docs/app/shared/components/download-form/download-form.component.ts

@@ -0,0 +1,36 @@
+/**
+ * @license
+ * Copyright Akveo. All Rights Reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */
+
+import { AfterViewInit, Component, Inject } from '@angular/core';
+import { NB_WINDOW, NbDialogRef } from '@nebular/theme';
+
+@Component({
+  selector: 'ngx-download-form',
+  templateUrl: './download-form.component.html',
+  styleUrls: ['./download-form.component.scss'],
+})
+export class DownloadFormComponent implements AfterViewInit {
+
+  constructor(@Inject(NB_WINDOW) private window,
+              protected ref: NbDialogRef<DownloadFormComponent>) {
+  }
+
+  ngAfterViewInit() {
+    hbspt.forms.create({
+      portalId: '2452262',
+      formId: '93007d7b-5f11-4dd8-bcfd-f8b99d31f31e',
+      target: '#hubspotForm',
+      submitButtonClass: 'btn',
+      css: '',
+      cssClass: 'custom-form',
+      redirectUrl: 'https://github.com/akveo/ngx-admin',
+    });
+  }
+
+  closeDialog() {
+    this.ref.close();
+  }
+}