Add README with licensing info.

README.markdown

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+Hi there. You've found the source code for my Jekyll-powered website/blog: [http://jasoncodes.com/]()
+
+All content (i.e. the `_posts` directory) is licensed under the [CC-BY-NC-ND 3.0 license](http://creativecommons.org/licenses/by-nc-nd/3.0/au/), which means you can copy the content, as long as you give me credit, do not alter it, and do not use it for commercial purposes. If you want to use this content for any other purpose, please contact me.
+
+Everything else is licensed under the MIT license. You might find some useful patches/addons for Jekyll in the `_plugins` directory. Go nuts.