added portfolio-builder app in intermediate section

Projects/2-Intermediate/Portfolio-Builder.md

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+# Portfolio Builder
+
+**Tier:** 2-Intermediate
+
+Allow users to create and showcase their personal portfolios dynamically.
+
+## User Stories
+
+- [ ] User can add personal information (name, bio, contact info).  
+- [ ] User can add multiple projects with descriptions, images, and links.  
+- [ ] User can preview the portfolio in a real-time view.  
+- [ ] User can edit or delete any section of their portfolio.  
+
+## Bonus Features
+
+- [ ] Store portfolio data in a database so that it can be accessed later.  
+- [ ] Allow users to choose from multiple themes or templates for their portfolio.  
+- [ ] Enable sharing portfolio via a public link.  
+- [ ] Implement authentication so that only the user can edit their portfolio.  
+
+## Useful Links and Resources
+
+- [Firebase](https://firebase.google.com) for realtime database and authentication  
+- [React](https://reactjs.org) for building dynamic UI  
+- [Tailwind CSS](https://tailwindcss.com) for styling  
+
+## Example Projects
+
+- [Portfolio Builder by Florin Pop](https://codepen.io/FlorinPop17/full/bGExgJv) – interactive portfolio builder example