Create Portfolio Website documentation

Added detailed project description, user stories, bonus features, useful links, and example projects for the Portfolio Website.

Projects/3-Advanced/Portfolio-Website.md

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+# Portfolio Website
+
+**Tier:** 3-Advanced
+
+## Description
+
+Build a full-stack personal portfolio website with a hidden admin panel
+for dynamic content management. All sections — projects, skills,
+experience, education, and certifications — are database-driven and
+manageable without touching code.
+
+## User Stories
+
+- [ ] User can view hero section with name, role, and download CV button
+- [ ] User can browse projects, skills, experience, and education sections
+- [ ] User can toggle between dark and light theme, persisted across visits
+- [ ] User can submit a contact form saved to the database
+- [ ] Admin can access a hidden panel via a secret URL
+- [ ] Admin can log in with a password verified server-side
+- [ ] Admin can create, edit, and delete projects, skills, education, experience, and certifications
+- [ ] Admin can upload project images stored in the database
+- [ ] Admin can update the CV download link without touching code
+
+## Bonus features
+
+- [ ] Rate-limit login attempts to prevent brute force
+- [ ] Store password as a SHA-256 hash — never plain text
+- [ ] Animate sections on scroll with IntersectionObserver
+- [ ] Show live project count in the hero stats
+
+## Useful links and resources
+
+- [ASP.NET Core MVC](https://learn.microsoft.com/en-us/aspnet/core/mvc/overview)
+- [Entity Framework Core](https://learn.microsoft.com/en-us/ef/core/)
+- [SHA-256 in C#](https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.sha256)
+- [ASP.NET Core Rate Limiting](https://learn.microsoft.com/en-us/aspnet/core/performance/rate-limit)
+- [IntersectionObserver API](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
+
+## Example projects
+
+- [themomattar.runasp.net](https://themomattar.runasp.net)