added fake-backend to AppModule

src/app/app.module.ts

@@ -18,6 +18,7 @@ import { InputComponent } from './chat/input/input.component';
 import { LoginComponent } from './account/login/login.component';
 import { TestComponent } from './test/test.component';
 import { RegisterComponent } from './account/register/register.component';
+import { fakeBackendProvider } from './utils/fake-backend';
 
 @NgModule({
   declarations: [
@@ -41,7 +42,9 @@ import { RegisterComponent } from './account/register/register.component';
     ReactiveFormsModule,
     AppRoutingModule,
   ],
-  providers: [],
+  providers: [
+    fakeBackendProvider,
+  ],
   bootstrap: [AppComponent]
 })
 export class AppModule { }