Added license information in source files.

lib/index.js

@@ -1,3 +1,21 @@
+/*
+* A simple plugin for Metalsmith to create directory indexes.
+* Copyright (C) 2018  David Soulayrol <david.soulayrol@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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
 const path = require('path')
 const readdir = require("recursive-readdir")
 

test/index.js

@@ -1,3 +1,8 @@
+/*
+* The unit tests for metalsmith-index.
+* Copyright (C) 2018  David Soulayrol <david.soulayrol@gmail.com>
+*/
+
 const assert = require('assert')
 const eol = require('eol')
 const fs = require('fs')