adding support for using [VSCode DevContainers](https://marketplace.v…

.devcontainer/devcontainer.json

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+// 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
+{
+	"name": "Existing Dockerfile",
+	"build": {
+		// Sets the run context to one level up instead of the .devcontainer folder.
+		"context": "..",
+		// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
+		"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": {},
+
+	// Uncomment to connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "devcontainer"
+}

Dockerfile

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+FROM ubuntu:22.04
+
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y make cmake zip curl wget git doxygen graphviz python3 python3-pip ninja-build openssh-server rsync zip cppcheck openocd && \
+    wget -O archive.tar.xz "https://developer.arm.com/-/media/Files/downloads/gnu/12.3.rel1/binrel/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi.tar.xz?rev=dccb66bb394240a98b87f0f24e70e87d&hash=B788763BE143D9396B59AA91DBA056B6" && \
+    tar xf archive.tar.xz -C /opt && \
+    rm archive.tar.xz && \
+    apt-get autoclean -y && \
+    apt-get autoremove -y && \
+    apt-get clean
+
+# setup container arm-gcc toolchain paths for cmake
+ENV PATH=/opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin:$PATH
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-gcc /usr/bin/arm-none-eabi-gcc
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-g++ /usr/bin/arm-none-eabi-g++
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-ar /usr/bin/arm-none-eabi-ar
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-as /usr/bin/arm-none-eabi-as
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-size /usr/bin/arm-none-eabi-size
+RUN ln -s /opt/arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi/bin/arm-none-eabi-objcopy /usr/bin/arm-none-eabi-objcopy

doc/VSCode_DevContainer.md

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+# VSCode Dev Container development
+
+A Dockerfile has been added, which contains a complete development environment that is consistent across all operating systems supporting Docker.
+
+When VSCode encounters a `.devcontainer` directory, it will prompt you to open the workspace inside a [DevContainer](https://code.visualstudio.com/docs/devcontainers/containers).  The entire build system is defined by the *DockerFile*, 
+
+## Initial Setup
+1. Install all [prerequisites](##prerequisites)
+2. Open `hellow_world.code-workspace` in VSCode.  You may be prompted to open the workspace in a dev container - select **Reopen In Container**.  This will build and start the docker contain, then reopen VSCode *inside* the container. 
+
+    ![Alt text](images/dev_container_prompt.png)
+
+    After VSCOde is running inside the container, the lower left corner of VSCode wil look something like this:
+
+    ![Alt text](images/env_devContainer.png)
+3. Your environment is all setup, continue with instructions from development-environment.md
+
+## Prerequisites
+
+### MS Windows based development
+
+* [Docker Desktop](https://www.docker.com/products/docker-desktop/)
+* WSL 2
+* VSCode
+* VSCode Extension : Dev Containers - Microsoft
+* VSCode Extension : C++ Extension Pack - Microsoft
+* VSCode Extension : CMake - twxs (optional - CMake syntax highliting)
+
+### Linux based development
+* Docker Desktop
+* VSCode
+* VSCode Extension : Dev Containers - Microsoft
+* VSCode Extension : C++ Extension Pack - Microsoft
+* VSCode Extension : CMake - twxs (optional - CMake syntax highliting)