VSCode support in generated layout

[pelikhan]

If you drop a .vscode/tasks.json file with the following content, a user can simply do Ctrl+Shift+B to build in VS Code.

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",
            "type": "shell",
            "command": "python build.py",
            "problemMatcher": [
                "$msCompile"
            ]
        }
    ]
}