Add Dockerfile and devcontainer.json for VS Code development environment

.devcontainer/Dockerfile

@@ -0,0 +1,12 @@
+FROM mcr.microsoft.com/vscode/devcontainers/base:debian
+
+RUN sudo apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && sudo apt-get install -y \
+        cmake-curses-gui \
+        clangd \
+        git \
+        libeigen3-dev \
+        libopenmpi-dev \
+        r-cran-rcpp \
+        r-cran-rinside 
+

.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/docker-existing-dockerfile
+{
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Uncomment the next line to run commands after the container is created.
+	// "postCreateCommand": "cat /etc/os-release",
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"twxs.cmake",
+				"llvm-vs-code-extensions.vscode-clangd"
+			]
+		}
+	},
+	// in case you want to push/pull from remote repositories using ssh
+	"mounts": [
+		"source=${localEnv:HOME}/.ssh,target=/home/vscode/.ssh,type=bind,consistency=cached"
+	]
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
+}