add files to project

web/js/amcharts/plugins/export/libs/xlsx/LICENSE

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+Copyright (C) 2012-2015  SheetJS
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+Except where noted, this license applies to any and all software programs and associated documentation files created by the Original Author and distributed with the Software:
+
+'jszip.js' is a modified version of JSZip, Copyright (c) Stuart Knightley, David Duponchel, Franz Buchinger, Ant'onio Afonso.  JSZip is dual licensed and is used according to the terms of the MIT License.