Bugs description

1. When creating a new file inside the project, it does not correctly create the doc file at the hat_docs/ folder.
2. When creating a new file outside the project, it shouldn't be possible and an error should raise; there must be a way to check whether a project exists and the file belongs inside its subfolders.

Expected behavior

1. When creating a new file, it and its docs counterpart should be create as well.
2. When create a new file, checking whether the file belongs to the project folder or subfolders,