feat: frontend updated readme (#1921)

frontend updated readme

Solves: PZ-4269)

src/main/app/README.md

@@ -1,26 +1,26 @@
-# App
+# Zaakafhandelcomponent frontend application
 
 This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 9.0.7.
 
+## Type safety
+
+Please read about our [end-to-end type safety](../../../docs/development/endToEndTypeSafety.md) in this Angular app with openapi-typescript, aligning frontend and backend. The ZacHttpClient ensures type-safe requests and responses for better debugging.
+
 ## Development server
 
-Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
+Run `npm run dev` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
 
 ## Code scaffolding
 
-Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
+From the folder you want the scaffolding done, run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
 
 ## Build
 
-Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory. Use the `--prod` flag for a production build.
+Run `npm run build` to build the project. The build artifacts will be stored in the `dist/` directory. Use the `--prod` flag for a production build. Run `npm run start` to run the built version.
 
 ## Running unit tests
 
-Run `ng test` to execute the unit tests via [Jest](https://jestjs.io/).
-
-## Running end-to-end tests
-
-Run `ng e2e` to execute the end-to-end tests via [Protractor](http://www.protractortest.org/).
+Run `npm run test` or `npm run test:watch` to execute the unit tests via [Jest](https://jestjs.io/).
 
 ## Further help