✨ Add the copier answer file to template

This can be used later to update the template more easily with `copier update`. A few
notes to make the changes more clear:

1. The file is named `{{ _copier_conf.answers_file }}.jinja` to use the `copier`
   configuration to template the filename, should we ever change it in the `copier.yml`
   file. This is recommended by the documentation.
2. We place the file in the `template` directory, else it is not actually generated
   when we run `copier copy`.
3. The contents are also entirely dictated by the documentation, but they make sense.
   The `_copier_answers` will contain the answers given by the user, and it seems they
   wrote a `to_nice_yaml` to make it easier to write to the targetted YAML file.

We link the corresponding documentation here for reference:

https://copier.readthedocs.io/en/latest/configuring/#the-copier-answersyml-file

Author: mbercx

template/{{ _copier_conf.answers_file }}.jinja

@@ -0,0 +1,2 @@
+# Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
+{{ _copier_answers|to_nice_yaml -}}