Add legacy note to repo

Update license.txt

Readme.md

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+# Legacy repository
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+Please note that this is a **legacy repo** for DataTables. The main source repo [is DataTables/DataTablesSrc](https://github.com/DataTables/DataTablesSrc).
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+Our distribution repos (for NPM, Nuget, etc packages) are the `DataTables/Dist-*` repos - e.g. [DataTables/Dist-DataTables](https://github.com/DataTables/Dist-DataTables). Each distribution repo has a core Javascript file or styling for DataTables or an extension. Please use our [download builder](https://datatables.net/download) to obtain the files you need, including for NPM, Nuget, CDN and download.
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 # DataTables plug-in for jQuery
 
 DataTables is a table enhancing plug-in for the [jQuery](//jquery.com) Javascript library, adding sorting, paging and filtering abilities to plain HTML tables with minimal effort. The stated goal of DataTables is:

license.txt

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-Copyright (c) 2008-2015 SpryMedia Limited
-http://datatables.net
+The MIT License (MIT)
+
+Copyright (c) 2008-present, SpryMedia Limited
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal