Create initial minimal configuration that can be used

[hkirsman]

1. What kind of folder/file structure to have? Let's create config.wunderio.yaml. This will come later than config.yaml - should we overwrite everything there or not? I guess not otherwise configuration that ddev adds to config.yaml would not work. In other words if developer has created project with drupal10 recipe, then let's allow ddev to configure these in config.yaml.

2. What's needed to get project started with this package?

Todo:

Add automatic composer install with something like this:

hooks:
  post-start:
    - exec: "[ ! -d \"/var/www/html/vendor\" ] && /var/www/html/.ddev/custom/appserver-build.sh || true"