Add copyright and module header to Text.Pandoc.CSS

See jgm#4592.

src/Text/Pandoc/CSS.hs

@@ -1,4 +1,38 @@
 {-# LANGUAGE NoImplicitPrelude #-}
+{-
+Copyright © 2006-2018 John MacFarlane <jgm@berkeley.edu>
+            2015-2016 Mauro Bieg
+            2015      Ophir Lifshitz <hangfromthefloor@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+-}
+
+{- |
+Module      : Text.Pandoc.CSS
+Copyright   : Copyright (C) 2006-2018 John MacFarlane
+Copyright   : © 2006-2018 John MacFarlane <jgm@berkeley.edu>,
+                2015-2016 Mauro Bieg,
+                2015      Ophir Lifshitz <hangfromthefloor@gmail.com>
+License     : GNU GPL, version 2 or above
+
+Maintainer  : John MacFarlane <jgm@berkeley@edu>
+Stability   : alpha
+Portability : portable
+
+Tools for working with CSS.
+-}
 module Text.Pandoc.CSS ( foldOrElse
                        , pickStyleAttrProps
                        , pickStylesToKVs