ADDED devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,20 @@
+FROM docker:20.10-dind
+
+# Switch to Debian-based image for better .NET support
+RUN apk add --no-cache bash curl gnupg
+
+# Install .NET 8 SDK
+ENV DOTNET_VERSION=8.0
+
+RUN curl -sSL https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh -o dotnet-install.sh \
+    && chmod +x dotnet-install.sh \
+    && ./dotnet-install.sh --version $DOTNET_VERSION --install-dir /usr/share/dotnet \
+    && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet
+
+# Verify installation
+RUN dotnet --version
+
+# Optional: install other tools
+RUN apk add --no-cache git make vim go
+
+USER root

.devcontainer/devcontainer.json

@@ -0,0 +1,20 @@
+// The Dev Container format allows you to configure your environment. At the heart of it
+// is a Docker image or Dockerfile which controls the tools available in your environment.
+//
+// See https://aka.ms/devcontainer.json for more information.
+{
+	"name": "Simple Id Server",
+	// Use "image": "mcr.microsoft.com/devcontainers/base:ubuntu-24.04",
+	// instead of the build to use a pre-built image.
+	"build": {
+        "context": ".",
+        "dockerfile": "Dockerfile"
+    }
+	// Features add additional features to your environment. See https://containers.dev/features
+	// Beware: features are not supported on all platforms and may have unintended side-effects.
+	// "features": {
+    //   "ghcr.io/devcontainers/features/docker-in-docker": {
+    //     "moby": false
+    //   }
+    // }
+}