shore-config - project init providing shore config

## Summary

Original Author: @dkirillov
`shore project init` should provide a `shore.yml`.

This shore config could have multiple profiles - either included or commented out - to show off the ability to do in-line configuration or use/source external configs from elsewhere.

`default` profile and executor config must be defined! So `executor.config.default` and `profiles.default` must exist so that what is provided by `shore project init` continues to function out of the box - you can do `shore render` right after you finish `shore project init`.

## Motivation

## Describe alternatives you've considered

## Additional context

Start at the implementation of `shore project init` and inspect how it creates project files, then run it and follow with `shore render`. The generated `shore.yml` should include usable `executor.config.default` and `profiles.default` entries, with example profiles showing inline or external configuration while rendering works immediately.

Written by the indexing model from the issue text.