allow to directly reference files in statement

Author: mzuenni

spec/2023-07-draft.md

@@ -477,8 +477,10 @@ Optionally, the language code can be left out; the default is then English (`en`
 The set of languages used can be different from what was used for the problem statement.
 Filetype can be either `.tex` for LaTeX files, `.md` for Markdown, or `.pdf` for PDF.
 
-Auxiliary files needed by the solution description files must all be in `solution/`.
+Auxiliary files needed exclusively by the solution description files should all be in `solution/`.
 `solution.<language>.<filetype>` should reference auxiliary files as if the working directory is `solution/`.
+Additionally, all images in `statement/` can also be referenced as if the working directory is `statement/`.
+Note that if a file with the same name exists in both `statement/` and `solution/` only the one in `solution/` can be referenced.
 
 Exactly how the solution description is used is up to the user or tooling.