Add a README and license files

README.md

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+# Blog OS (Minimal Kernel)
+
+[![Build Status](https://github.com/phil-opp/blog_os/workflows/Code/badge.svg?branch=post-3.1)](https://github.com/phil-opp/blog_os/actions?query=workflow%3A%22Code%22+branch%3Apost-3.1)
+
+This repository contains the source code for the [Minimal Kernel][post] post of the [Writing an OS in Rust](https://os.phil-opp.com) series.
+
+[post]: https://os.phil-opp.com/minimal-kernel
+
+**Check out the [master branch](https://github.com/phil-opp/blog_os) for more information.**
+
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+Note that this only applies to this git branch, other branches might be licensed differently.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.