Add README

README.md

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+# arnes.space
+
+This repository contains the source files for https://arnes.space. It uses [eleventy](https://www.11ty.dev/docs/) and [pnpm](https://pnpm.io/) to build a static website from a bunch of files that you can find in the `src/` folder.
+
+## Available Commands
+
+``` sh
+# build the complete site
+pnpm build
+
+# run a local server that automatically changes as you update content
+pnpm start # is the same as `pnpm watch`
+```
+
+## Build Environment
+
+The build environment is described in `flake.{nix,lock}` and `.envrc`. You can use [direnv](https://direnv.net/) and [nix with flakes support](https://nixos.org/) to automatically drop into a shell that contains all tools for building the website.