Added support for user configuration.

document-generator/document-template/preamble.tex

@@ -0,0 +1,14 @@
+%% Copyright (C) 2018 The University of Sheffield
+%%               2018 The University of Paris-Sud
+%%
+%% License:
+%%   This program can be redistributed and/or modified under the terms
+%%   of the LaTeX Project Public License Distributed from CTAN
+%%   archives in directory macros/latex/base/lppl.txt; either
+%%   version 1 of the License, or any later version.
+%%   OR
+%%   The 2-clause BSD-style license.
+%%  
+%%   SPDX-License-Identifier: LPPL-1.0+ OR BSD-2-Clause
+
+%% This is a placeholder for user-specific configuration and packages. 

document-generator/document-template/root.tex

@@ -11,6 +11,13 @@
 %%  
 %%   SPDX-License-Identifier: LPPL-1
 
+%% Warning: Do Not Edit!
+%% =====================
+%% This is the root file for the Isabelle/DOF. 
+%% All customization and/or additional packages should be added to the file 
+%% preamble.tex. 
+
+
 \RequirePackage{ifvtex}
 \documentclass[fontsize=10pt,DIV12,paper=a4,open=right,twoside,abstract=true]{scrreprt}
 \usepackage[T1]{fontenc}