Attach PPI pixels to documents

src/document/ppi_import.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "assets/ppi_header.h"
+#include "document/document.h"
+
+namespace pp::document {
+
+[[nodiscard]] pp::foundation::Result<CanvasDocument> import_ppi_project_document(
+    const pp::assets::PpiDecodedProjectImages& project);
+
+}