chore: add installation guide

README.md

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+# my little nix system
+
+## installation
+### linux - desktop
+1. Boot up NixOS live iso on a system.
+2. Clone flake
+3. Make a folder for the system under hosts/
+4. Run `nixos-generate-config --dir hosts/HOSTNAME`
+6. Set LUKS encryption passphrase via `sudo nano /tmp/secret.key`
+7. Run disko `sudo nix --experimental-features "nix-command flakes" run github:nix-community/disko/latest -- --mode destroy,format,mount /path/to/disko-config.nix`
+8. Copy over flake directory to new system
+9. Install system with `sudo nixos-install --flake .#HOSTNAME` - set a password for root
+10. Reboot into new system.
+11. Open a terminal and run `passwd`
+12. Log into normal user and configure networking via `nmtui`
+13. Apply dotfiles via `stow stow` in the base of the dotfiles directory.
+14. Download a wallpaper and apply it via `matugen image`
+
+#### Secure boot
+If a system has a secure boot, install the system WITHOUT the secureboot module. Once the steps above have been completed return here.
+
+1.  Generate secureboot signing keys with `sudo nix run nixpkgs#sbctl create-keys`
+2.  Rebuild the system WITH the secureboot module.
+3.  Run `sudo sbctl verify` to check if SOME of the files are signed.
+4.  Reboot your system, in the UEFI enable onboarding secureboot keys, usually a setting called 'Reset to setup mode'.
+5.  Boot into your NixOS system and run `sudo sbctl enroll-keys --microsoft` to enroll your keys.
+6.  Reboot into your UEFI again and enable secure boot.
+
+### macOS
+1.  Install xcode developer tools, determinate nix and brew.
+```sh
+xcode-select --install
+curl -fsSL https://install.determinate.systems/nix | sh -s -- install --determinate
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+```
+2.  Install Nix flake to system. `nix run nix-darwin/master#darwin-rebuild -- switch`
+3.  Reboot
+4.  Install OpenUTAU `https://github.com/stakira/OpenUtau/releases/latest/download/OpenUtau-osx-x64.dmg`
+5.  Configure non-automated settings
+- set accent colour
+- set display to be spacious
+- customise spotlight settings
+- disable bluetooth
+- enable firewall
+- set wallpaper
+- enable switching workspace keybinds