Create a Basic Navbar Component

We need a simple navbar component to be added to the project. This component should be placed in the src/components folder and will later be used for navigation.

Tasks:

1. Create a Navbar.js file in the src/components/ folder.
2. Inside Navbar.js, create a basic navbar structure using standard HTML/JSX.
3. Add placeholder links for Home, About, News, Converter, and Watchlist (these will be functional later).
4. Ensure the navbar looks clean with simple CSS (basic styling is enough for now).
5. Include the Navbar in App.js so it is visible on every page.

Expected Outcome:

A basic, styled navbar should be visible across all pages of the app. The links should not be functional yet but should be placeholders for future routing.