diff --git a/copilot-setup-steps.yml b/copilot-setup-steps.yml
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+# GitHub Copilot Setup Steps for NLWebNet
+# This file defines the setup steps needed to work with the NLWebNet repository
+
+name: Setup .NET 9 Environment for NLWebNet
+description: Install .NET 9 SDK and restore dependencies for the NLWebNet library and demo application
+
+steps:
+  - name: Install .NET 9 SDK
+    description: Download and install the .NET 9 SDK for Ubuntu using the official Microsoft install script
+    run: |
+      # Check if .NET 9 is already installed
+      if command -v dotnet &> /dev/null && dotnet --list-sdks | grep -q "9\."; then
+        echo "✅ .NET 9 SDK is already installed"
+        dotnet --version
+        exit 0
+      fi
+      
+      # Download and install .NET 9 SDK using official Microsoft install script
+      echo "📦 Installing .NET 9 SDK..."
+      curl -sSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel 9.0 --install-dir ~/.dotnet
+      
+      # Add .NET to PATH if not already present
+      if [[ ":$PATH:" != *":$HOME/.dotnet:"* ]]; then
+        echo 'export PATH="$HOME/.dotnet:$PATH"' >> ~/.bashrc
+        export PATH="$HOME/.dotnet:$PATH"
+      fi
+      
+      # Verify installation
+      echo "🔍 Verifying .NET installation..."
+      dotnet --version
+      dotnet --info
+
+  - name: Restore NuGet packages
+    description: Restore all NuGet package dependencies for the solution
+    run: |
+      dotnet restore
+
+  - name: Build solution
+    description: Build the entire solution to verify setup is working
+    run: |
+      dotnet build --configuration Debug --no-restore
+
+  - name: Verify setup
+    description: Run a quick verification that everything is set up correctly
+    run: |
+      echo "✅ .NET 9 SDK installed successfully"
+      echo "✅ NuGet packages restored"
+      echo "✅ Solution builds successfully"
+      echo ""
+      echo "🚀 You can now work with the NLWebNet repository!"
+      echo ""
+      echo "Quick start commands:"
+      echo "  - Build: dotnet build"
+      echo "  - Test: dotnet test"
+      echo "  - Run demo: dotnet run --project demo"
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