Add README

README.md

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+This is the source for [my site](https://samasaur1.github.io).
+
+It's a Jekyll site, and the site is packaged with [Nix](https://nixos.org/). This means that you can enter a dev shell by running `nix develop` in this directory, and then you can run `jekyll build` or `jekyll serve -DH0.0.0.0` as normal.
+
+In CI, you can run:
+```
+JEKYLL_ENV=production nix develop --ignore-environment --keep JEKYLL_ENV -c jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
+```
+
+If you have direnv and nix-direnv installed, you can create a file called `.envrc` with the following contents:
+```
+use flake
+```
+which will then automatically give you access to Jekyll when you `cd` into the directory.