License blog content under CC BY-NC

blog/content/README.md

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+# Blog Content
+
+This folder contains the content for the _"Writing an OS in Rust"_ blog.
+
+## License
+
+This folder is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, available in [LICENSE-CC-BY-NC](LICENSE-CC-BY-NC) or under <http://creativecommons.org/licenses/by-nc/4.0/>.
+
+All _code examples_ between markdown code blocks denoted by three backticks (`\``) are 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.