add initial version of devcontainer (#7071)

.devcontainer/Dockerfile

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+# syntax=docker/dockerfile:1
+# base image from ggrouv: https://github.com/ggurov/rusefibuildcontainer
+FROM ubuntu:mantic
+RUN apt-get -y update
+RUN apt-get -y install make automake autoconf gcc-12-arm-linux-gnueabi gcc-12-arm-linux-gnueabi-base gcc-arm-none-eabi binutils-arm-none-eabi git nano openjdk-21-jdk-headless mtools dosfstools xxd
+RUN apt-get -y install openssh-server cmake rsync gdb-multiarch build-essential g++-12 gcc-12-multilib g++-12-multilib zip zsh
+# used for remote non-devcontainer use ex: (https://blog.jetbrains.com/clion/2020/01/using-docker-with-clion/) [also on vscode: https://code.visualstudio.com/remote/advancedcontainers/develop-remote-host]
+RUN useradd -m rusefi && yes password | passwd rusefi
+RUN update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 12 --slave /usr/bin/g++ g++ /usr/bin/g++-12 --slave /usr/bin/gcov gcov /usr/bin/gcov-12
+CMD service ssh start && /bin/bash

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+{
+	"name": "rusEFI-devcontainer",
+	"build": {
+		// Path is relative to the devcontainer.json file.
+		"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": [
+		"2222:22", // ssh on container
+		29002 // simulator
+	],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "git submodule update --init",
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"eamodio.gitlens",
+				"marus25.cortex-debug",
+				"Gruntfuggly.todo-tree",
+				"ms-vscode.cpptools",
+				"vadimcn.vscode-lldb"
+			],
+			"settings": {
+				"editor.tabSize": 4,
+				"terminal.integrated.defaultProfile.linux": "zsh",
+				"terminal.integrated.profiles.linux": {
+					"bash": {
+						"path": "bash",
+						"icon": "terminal-bash"
+					},
+					"zsh": {
+						"path": "zsh"
+					}
+				}
+			}
+		}
+	}
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.devcontainer/devcontainer.md

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+## devcontainer 101
+
+#### why use this?:
+A development container is a Docker container that vsCode, through an extension [(Visual Studio Code Dev Containers)](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers), uses to set up a development environment isolated from the host.
+
+A more nerdy explanation is available at: https://code.visualstudio.com/docs/devcontainers/containers
+
+In the case of rusefi, it is used to set up the relatively complicated toolset as an alternative to [setup_linux_environment.sh](https://github.com/rusefi/rusefi/blob/master/firmware/setup_linux_environment.sh),Since the script, in addition to only working on Linux, only works for installations that use APT as a package manager (ie any Debian/Ubuntu derivative), and would only work to build the firmware (a couple of extra dependencies are used for tests and the simulator)
+
+
+#### System requirements:
+
+Linux:
+- Docker CE with Docker Compose, also vscode
+
+macOS: 
+- Docker Desktop 2.0+.
+
+Windows:
+- Docker Desktop 2.0 and up
+- WSL 2
+
+for WSL 2:
+- Windows 10 version 2004 and higher (Build 19041 and higher) or Windows 11 
+
+howto install WSL2: https://learn.microsoft.com/en-us/windows/wsl/install
+
+
+
+in case of a error similar to:
+
+| Unable to detect if server is already installed: Error: Failed to probe if server is already installed: code: Failed to probe if server is already installed: code: 4294967295, , Unsupported console settings. In order to use this feature, the legacy console must be disabled.
+
+https://learn.microsoft.com/en-us/windows/wsl/troubleshooting#error-0x80040306-on-installation
+> This has to do with the fact that we do not support legacy console. To turn off legacy console:
+> 
+> Open cmd.exe
+> Right click title bar -> Properties -> Uncheck Use legacy console
+> Click OK
+
+In addition, on Windows you have to clone the repository inside WSL, otherwise you will have performance problems since the container will have a longer bind (having to go from the docker container to WSL and from WSL to Windows)
+
+Once the container creation is complete, you will be able to compile the firmware or the simulator or the tests.
+For the firmware you will want to use (firmware/bin/compile.sh) instead of make to be able to select the variant of your board.
+
+note:
+This still needs a little testing and feedback to see if this same readme or the docker image needs to be improved. If you have any questions, ask the Discord server or personally to @derek_boom (Diego)