docs: explain how to get settings in Angular

docs/en/UI/Angular/Settings.md

@@ -1,3 +1,59 @@
-# Angular UI: Settings
+# Settings
 
-> This document explains how to get setting values in an Angular application. See the [settings document](../../Settings.md) to learn the setting system.
+You can get settings on the client-side using the [config state service](./Config-State.md) if they are allowed by their setting definition on the server-side.
+
+> This document only explains how settings work in the Angular UI projects. See the [settings document](../../../Settings.md) to understand the ABP setting system.
+
+## Before Use
+
+To use the `ConfigStateService`, you must inject it in your class as a dependency. You do not have to provide the service explicitly, because it is already **provided in root**.
+
+```js
+import { ConfigStateService } from '@abp/ng.core';
+
+@Component({
+  /* class metadata here */
+})
+class DemoComponent {
+  constructor(private config: ConfigStateService) {}
+}
+```
+
+## How to Get a Specific Setting
+
+You can use the `getSetting` method of `ConfigStateService` to get a specific setting from the configuration state. Here is an example:
+
+```js
+// this.config is instance of ConfigStateService
+
+const defaultLang = this.config.getSetting("Abp.Localization.DefaultLanguage");
+// 'en'
+```
+
+### How to Get All Settings From the Store
+
+You can use the `getSettings` method of `ConfigStateService` to obtain all settings as an object where the object properties are setting names and property values are setting values.
+
+```js
+// this.config is instance of ConfigStateService
+
+const settings = this.config.getSettings();
+// all settings as a key value pair
+```
+
+Additionally, the method lets you search settings by **passing a keyword** to it.
+
+```js
+const localizationSettings = this.config.getSettings("Localization");
+/*
+{
+	'Abp.Localization.DefaultLanguage': 'en'
+}
+*/
+```
+
+Beware though, **settings search is case-sensitive**.
+
+## What's Next?
+
+- [Permission Management](./Permission-Management.md)