fix: Added Angular usage to readme

Author: guillemc23

packages/ui-pager-indicator/blueprint.md

@@ -28,6 +28,28 @@ Run the following command from the root of your project:
 PagerIndicator add page control for Pager or other Paging Views.
 ```
 
+## Usage in Angular
+
+
+If you are planning to use an indicator, add the following to your module:
+
+```typescript
+import { registerElement } from "@nativescript/angular";
+import { PagerIndicator } from "@nativescript-community/ui-pager-indicator";
+registerElement("PagerIndicator", () => PagerIndicator)
+```
+
+Then in your template:
+```html
+<Pager id="pager" [items]="items"
+    ...
+</Pager>
+<PagerIndicator pagerViewId="pager" />
+```
+
+### Examples
+- [Indicator Pager](demo-snippets/ng/indicator)
+  - A simple pager example using dynamic content and indicator.
 
 ## Usage in Vue