Add site README

README.md

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+# [kneasle.github.io](https://kneasle.github.io)
+
+This repo contains the source code for my personal website, hosted at
+[kneasle.github.io](https://kneasle.github.io).  Everything - content, icons, CSS/web design, etc.
+- is made from scratch by me.  The site is built using a one-off site generator and hosted using
+GitHub pages.
+
+## Building
+
+To build it, you need to have [TypeScript](https://www.typescriptlang.org/) and
+[Deno](https://deno.land) installed, and then run:
+
+```bash
+deno task build
+```
+
+This will place the rendered site in a directory called `rendered/`.  This can then be either be
+served using a basic HTTP server (like `python3 -m http.server`) or the site can be served
+automatically with:
+
+```bash
+deno task serve
+```
+
+This will automatically serve the generated files on `localhost:8000` and also rebuild the site
+whenever the source files are changed.