Add Global feature docs for Angular

docs/en/UI/Angular/Config-State-Service.md

@@ -13,7 +13,7 @@ import { ConfigStateService } from '@abp/ng.core';
   /* class metadata here */
 })
 class DemoComponent {
-  constructor(private config: ConfigStateService) {}
+  constructor(private config: \) {}
 }
 ```
 

docs/en/UI/Angular/GlobalFeatures.md

@@ -0,0 +1,43 @@
+# Angular: Global Features API
+
+`ConfigStateService.getGlobalFeatures` API allows you to get the enabled features of the [Global Features](../../Global-Features.md) in the client side.
+
+> This document only explains the JavaScript API. See the [Global Features](../../Global-Features.md) document to understand the ABP Global Features system.
+
+## Usage
+
+````js
+
+import { ConfigStateService } from '@abp/ng.core';
+
+@Component({
+  /* class metadata here */
+})
+class DemoComponent {
+  constructor(private config: ConfigStateService) {}
+}
+
+// Gets all enabled global features.
+const getGlobalFeatures = this.config.getGlobalFeatures ();
+
+// { enabledFeatures: [ 'Shopping.Payment', 'Ecommerce.Subscription' ] }
+
+// or
+this.config.getGlobalFeatures$().subscribe(getGlobalFeatures => {
+   // use getGlobalFeatures here
+})
+
+// Check the global feature is enabled
+this.config.getGlobalFeatureIsEnabled('Ecommerce.Subscription')
+
+true
+
+> this.config.getGlobalFeatureIsEnabled('My.Subscription')
+
+false
+
+// or
+this.config.getGlobalFeatureIsEnabled$('Ecommerce.Subscription').subscribe((isEnabled:boolean) => {
+   // use isEnabled here
+})
+