Add devcontainer integration for vscode

This will auto setup the whole build environment based on zephyr's docker containers. Prerequisites are:
- docker is accessable by the user without using sudo
- vscode with remote container extension is installed

.devcontainer/Dockerfile

@@ -0,0 +1,50 @@
+ARG ZEPHYR_TAG=latest
+FROM zephyrprojectrtos/ci:${ZEPHYR_TAG}
+
+# Set default to bash instead sh
+ENV SHELL /bin/bash
+
+RUN add-apt-repository ppa:tiac-systems/doxygen
+
+# Install packages
+RUN apt-get -y update && \
+	apt-get -y upgrade && \
+	apt-get install --no-install-recommends -y \
+	doxygen \
+	graphviz \
+	mscgen \
+	latexmk \
+	librsvg2-bin \
+	texlive-latex-base \
+	texlive-latex-extra \
+	texlive-fonts-recommended \
+	usbutils \
+	vim
+
+# Clean up stale packages
+RUN apt-get clean -y && \
+	apt-get autoremove --purge -y && \
+	rm -rf /var/lib/apt/lists/*
+
+# Add bash completion script
+ADD ./bash_completion /home/user/.bash_completion
+RUN mkdir -p /home/user/.bash_completion.d
+
+# Switch to 'user' context
+USER user
+
+RUN mkdir -p /home/user/.vscode-server/extensions
+
+# Set working directory
+WORKDIR /workdir
+VOLUME ["/workdir"]
+
+# Adjust 'user' home directory permissions
+USER root
+RUN chown -R user:user /home/user
+
+# Make 'user' default on launch
+USER user
+
+# Launch bash shell by default
+CMD ["/bin/bash"]

.devcontainer/bash_completion

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+for bcfile in ~/.bash_completion.d/* ; do
+	. $bcfile
+done

.devcontainer/devcontainer.json

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+
+{
+	"name": "Bridle",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Specify version for Zephyr Container
+		// See https://github.com/zephyrproject-rtos/docker-image/releases
+		"args": { "ZEPHYR_TAG": "v0.26.4" }
+	},
+	// Needed for USB devices in container
+	"privileged": true,
+	"postCreateCommand": "bash .devcontainer/post-create.sh /workspace ${localWorkspaceFolderBasename}",
+	"postStartCommand": "bash .devcontainer/post-start.sh /workspace",
+	// Mount and set workspace folder
+	"workspaceMount": "source=${localWorkspaceFolder}/..,target=/workspace,type=bind",
+    "workspaceFolder": "/workspace/${localWorkspaceFolderBasename}",
+	// Username in container - align with Dockerfil
+    "remoteUser": "user",
+	"mounts": [
+		// Persist installed extensions in container
+		"source=bridle-devcontainer-extensions,target=/home/user/.vscode-server/extensions,type=volume",
+		// Allow attaching USB devices to running container
+		"source=/dev/bus/usb,target=/dev/bus/usb,type=bind"
+	],"customizations": {
+		"vscode": {
+			"settings": {
+				"editor.trimAutoWhitespace": true,
+				"editor.insertFinalNewline": true
+			},
+			"extensions": [
+				"marus25.cortex-debug"
+			]
+		}
+	}
+}

.devcontainer/post-create.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+WORKSPACE_DIR=$1
+REPO_NAME=$2
+
+cd $WORKSPACE_DIR
+
+if [ ! -d ".west" ]; then
+    west init -l $REPO_NAME
+fi
+
+west update
+west bridle-export
+
+
+pip3 install --upgrade --requirement zephyr/scripts/requirements.txt
+pip3 install --upgrade --requirement bridle/scripts/requirements.txt

.devcontainer/post-start.sh

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+#!/bin/bash
+
+WORKSPACE_DIR=$1
+
+cd $WORKSPACE_DIR
+
+west update

CODEOWNERS

@@ -71,3 +71,6 @@
 
 # Get all docs reviewed
 *.rst                                     @rexut
+
+# Devcontainer setup for vscode
+/.devcontainer/                           @rexut