How can I customize the default set of files generated when creating a new project?

[doguto]

When I create a new project, these files and folders are created by default.

|- .pio/
|- .vscode/
|    |- extensions.json
|- include/
|    |- README.md
|- lib/
|    |- README.md
|- src/
|- test/
|    |- README.md
|- .gitignore
|- platformio.ini

These are good, but I want to add mbed_app.json to these.
How can I do this?