Basic README contents (#12)

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Co-authored-by: Marjolein Tamis <80948475+marjoleintamis@users.noreply.github.com>

frontend/README.md

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 # Electoral Council election results management system - Frontend
 
+## Development
+
+### Prerequisites
+- [Node](https://nodejs.org) v20
+
+
+### Building
+
+Install JavaScript dependencies
+
+```sh
+npm install
+```
+
+Install Playwright dependencies
+
+```sh
+npx playwright install --with-deps
+```
+
+### Running
+
+This runs the client with a (client-side) mock API
+
+```sh
+npm run dev
+```
+
+### Linting
+```sh
+npm run lint
+```
+
+### Testing
+
+Unit tests
+```sh
+npm run test
+```
+
+e2e tests
+```sh
+npm run e2e
+
+# with Playwright web ui
+npm run e2eui 
+```
+
+### UI Component development
+
+Develop and test UI components in isolation.
+
+```sh
+npm run ladle
+```
+Open: http://localhost:61000/
+
+## Structure
+
+### Dependencies
+
+The application uses the following dependencies:
+
+- `react`: creating efficient, declarative, and component-based web applications.
+- `react-dom`: DOM implementation for rendering UI
+- `react-dom-router`: Handling browser routing for React applications
+
+#### Development dependencies
+
+- `typescript`: Strongly typed layer on top of JavaScript
+- `msw`: Mock Service Worker for mocking the server, client side
+- `vite`: frontend build tool
+- `ladle`: simple development and test environment for UI components
+
+#### Testing / linting dependencies
+
+- `vitest`: Jest compatible unit test framework
+- `testing-library`: (React) component and dom test utilities
+- `playwright`: e2e testing framework
+- `prettier`: Opinionated code formatter
+- `eslint`: Linter
+