feat(demo): added backend integration descriptions

src/app/pages/backend-integration/integration-description/integration-description.component.ts

@@ -0,0 +1,32 @@
+import {Component, Input} from '@angular/core';
+
+@Component({
+  selector: 'ngx-integration-description[features][url][buttonText]',
+  template: `
+    <div class='header'> For why do you need a backend admin dashboard?</div>
+    <div class='subheader'> To save up to 300 hours on development. To use backend as ready to use examples. </div>
+    <div class='header2'> Features </div>
+    <ul class='features-list'>
+      <li *ngFor='let feature of features'
+           class='feature'
+      >
+        - {{ feature }}
+      </li>
+    </ul>
+    <a nbButton
+       [href]='url'
+       status="primary"
+       target="_blank"
+    > {{buttonText}} </a>
+  `,
+  styleUrls: ['./integration-description.component.scss'],
+})
+export class IntegrationDescriptionComponent {
+
+  @Input() features: string[];
+  @Input() url: string;
+  @Input() buttonText: string;
+
+  constructor() { }
+
+}