Add README with sample listing and descriptions

README.md

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+# Code Samples
+
+This repository contains various sample projects for different technologies and frameworks.
+
+## Sample List
+
+### WPF (Windows Presentation Foundation) Samples
+
+- **LivetWPFSampleApp**: Sample application using the Livet MVVM framework for WPF
+- **MVVMLightWPFSampleApp**: Sample application using the MVVM Light framework for WPF
+- **PrismWPFSampleApp**: Sample application using the Prism framework for WPF
+- **wpfedu**: WPF 4.5 education samples
+  - Contains various examples of WPF features and controls
+
+### Enterprise Library 5 Samples
+
+- **EntLib5Samples**: Examples of using the Microsoft Enterprise Library 5
+  - Hello World examples
+  - Application Block examples (Database, Logging, etc.)
+
+### Other .NET Samples
+
+- **GroupedGridView**: Sample demonstrating a grouped grid view control
+- **RxApp**: Reactive Extensions (Rx) application sample
+- **primesample**: Prime number calculation examples
+
+### Web Development Samples
+
+- **ASP.NET Web API JavaScript Scenarios - Comments**: Examples of ASP.NET Web API with JavaScript
+- **TwitterAppSample**: Application that interacts with the Twitter API
+
+### Java Samples
+
+- **annotationprocessor**: Java annotation processor sample
+
+## How to Use
+
+Each sample directory contains a complete application or project that can be opened with the appropriate development environment:
+
+- WPF projects: Open the .sln file in Visual Studio
+- Java projects: Import into your preferred Java IDE
+- Web projects: Use appropriate web development environment
+
+## Requirements
+
+Different samples have different requirements depending on the technologies they use. Please refer to the specific samples for detailed requirements.