Add study notes: 22 areas documented by Diego IA

study/csharp.md

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+# C# — Estudo
+
+_Fonte: project-based-learning_
+
+## 📚 Recursos
+
+- RPG Game: OOP, classes, game loop
+- Rogue-like: procedural generation, tilemaps
+- Xamarin: mobile apps cross-platform (iOS + Android)
+- CoreWiki: ASP.NET Core + Razor Pages (CMS completo)
+
+## 📝 Conceitos
+
+- **.NET Ecosystem**: .NET Core (cross-platform) vs .NET Framework (Windows)
+- **ASP.NET Core**: MVC, Razor Pages, Minimal APIs
+- **Xamarin/MAUI**: Mobile cross-platform com C#
+- **Unity**: Game engine (não listado mas principal uso de C#)
+- **Entity Framework**: ORM para bancos relacionais