Relicense this repository under the Apache v2 and MIT licenses.

* Move licensing information to the top level of the repo.
* Add README.md file with license and contributing info.

Author: samth

LICENSE

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+This component of Racket is distributed under the under the Apache 2.0
+and MIT licenses. The user can choose the license under which they
+will be using the software. There may be other licenses within the
+distribution with which the user must also comply.
+
+See the files
+  https://github.com/racket/racket/blob/master/racket/src/LICENSE-APACHE.txt
+and
+  https://github.com/racket/racket/blob/master/racket/src/LICENSE-MIT.txt
+for the full text of the licenses.
+
+This repository contains the text of the R6RS standard, in
+r6rs-doc/r6rs/scribblings/r6rs-{lib-std,std}/. That document is
+distributed with the following license:
+
+    We intend this report to belong to the entire Scheme community,
+    and so we grant permission to copy it in whole or in part without
+    fee. In particular, we encourage implementors of Scheme to use
+    this report as a starting point for manuals and other
+    documentation, modifying it as necessary.
+
+

README.md

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+# r6rs
+
+This the source for the Racket packages: "r6rs", "r6rs-doc", "r6rs-lib", "r6rs-test".
+
+### Contributing
+
+Contribute to Racket by submitting a [pull request], reporting an
+[issue], joining the [development mailing list], or visiting the
+IRC or Slack channels.
+
+### License
+
+Racket, including these packages, is free software, see [LICENSE]
+for more details.
+
+By making a contribution, you are agreeing that your contribution
+is licensed under the [Apache 2.0] license and the [MIT] license.
+
+[MIT]: https://github.com/racket/racket/blob/master/racket/src/LICENSE-MIT.txt
+[Apache 2.0]: https://www.apache.org/licenses/LICENSE-2.0.txt
+[pull request]: https://github.com/racket/r6rs/pulls
+[issue]: https://github.com/racket/r6rs/issues
+[development mailing list]: https://lists.racket-lang.org
+[LICENSE]: LICENSE