feat: finished with the exercise about installing ngrx and ngrx devtools

content/en/course/angular/ngrx/installing-ngrx-store/index.mdx

@@ -90,4 +90,50 @@ Click [this link](https://chrome.google.com/webstore/detail/redux-devtools/lmhkp
 
 ![Redux dev tools](https://github.com/ywarezk/academeez/blob/main/content/en/course/angular/ngrx/installing-ngrx-store/redux-devtools.gif?raw=true)
 
+### Inspect your state with Redux dev tools
+
+Let's populate our state with some initial data, and make sure we can examine that data with Redux dev tools.
+
+```typescript title="src/app/app.module.ts"
+import {NgModule, isDevMode} from '@angular/core';
+import {BrowserModule} from '@angular/platform-browser';
+
+import {AppComponent} from './app.component';
+import {StoreModule} from '@ngrx/store';
+import {StoreDevtoolsModule} from '@ngrx/store-devtools';
+
+@NgModule({
+  declarations: [AppComponent],
+  imports: [
+    BrowserModule,
+    StoreModule.forRoot(
+      {
+        counter: () => 0,
+      },
+      {}
+    ),
+    StoreDevtoolsModule.instrument({maxAge: 25, logOnly: !isDevMode()}),
+  ],
+  providers: [],
+  bootstrap: [AppComponent],
+})
+export class AppModule {}
+```
+
+We populated the state with `counter: 0` (it's not important the exact syntax, we will learn about reducers later on).
+
+### Examine the state
+
+Run our app: 
+
+```bash
+npx ng serve
+```
+
+open the developer tools, you should see a new tab in the developer tools called `Redux`, this tab was added after installing the extension of `Redux Dev Tools` and you can use it to inspect the state.  
+
+![Inspect State](https://github.com/ywarezk/academeez/blob/main/content/en/course/angular/ngrx/installing-ngrx-store/examine-state.gif?raw=true)
+
 </Steps>
+
+This basic app will be the baseline of all the exercises you will do in the `NGRX` chapter.