Add README and license

Author: arqunis

LICENSE.md

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+ISC License (ISC)
+
+Copyright (c) 2016, Serenity Contributors
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.

README.md

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+# Site source code
+
+This is source code for the https://serenity-rs.github.io site, built using
+Vite.
+
+## Contributing
+
+If you wish to contribute, simply set up a [Node.js][node] environment with the
+NPM package manager.
+
+Once you have Node and NPM, install the necessary dependencies with `npm install`.
+
+Afterwards, you may use `npm run dev` to run a dev server to test changes
+locally, which will run on `localhost:3000`. Once you are satisfied with the
+changes, run `npm run build` to build the site. This will create a minified,
+bundled version of the site into the `docs/` directory, which can directly be
+served by a HTTP server like [Nginx][nginx], though, of course, this site is
+meant to be run on Github Pages.
+
+This site uses [TypeScript][ts] and [SCSS][sass-scss] instead of regular
+JavaScript and CSS. When writing CSS, the [RSCSS][rscss] system is used.
+
+[node]: https://nodejs.org
+[nginx]: https://nginx.org
+[ts]: https://typescriptlang.org
+[sass-scss]: https://sasscss.com
+[rscss]: https://rstacruz.github.io/rscss/
+
+## License
+
+Source code of this site is under the [ISC license](LICENSE.md).