add proper readme file

README.md

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-Test
+# Config Files
+
+This repository contains configuration files for my NixOS, macOS, and WSL
+hosts.
+
+---
+
+## NixOS - From Live Disk
+
+Format drives and build system from any NixOS host, including the live
+installer disk:
+
+**This will erase your drives; use at your own risk!**
+
+```bash
+lsblk # Choose the disk you want to wipe
+nix-shell -p nixFlakes
+nix run github:nmasur/dotfiles#installer -- nvme0n1 desktop
+```
+
+## NixOS - From Existing System
+
+If you're already running NixOS, you can switch to this configuration with the
+following command:
+
+```bash
+nix-shell -p nixFlakes
+sudo nixos-rebuild switch --flake github:nmasur/dotfiles#desktop
+```
+
+## Windows - From NixOS WSL
+
+After [installing NixOS on
+WSL](https://xeiaso.net/blog/nix-flakes-4-wsl-2022-05-01), you can switch to
+the WSL configuration:
+
+```
+nix-shell -p nixFlakes
+sudo nixos-rebuild switch --flake github:nmasur/dotfiles#wsl
+```
+
+## macOS
+
+To get started on a bare macOS installation, first install Nix:
+
+```bash
+sh -c "$(curl -L https://nixos.org/nix/install)"
+```
+
+Then use Nix to build nix-darwin:
+
+```bash
+nix-build https://github.com/LnL7/nix-darwin/archive/master.tar.gz -A installer
+./result/bin/darwin-installer
+```
+
+Then switch to the macOS configuration:
+
+```bash
+darwin-rebuild switch --flake .#macbook
+```
+
+## Flake Templates
+
+You can also use the templates as flakes for starting new projects:
+
+```bash
+nix flake init --template github:nmasur/dotfiles#poetry
+```