docs: add nvim setup guide

README.md

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+# Neovim config
+
+This repo contains my Neovim configuration only.
+You still need Neovim installed on the machine.
+
+## Quick start
+
+```bash
+git clone https://git.sailorpunisher.com/sailor/nvim-config.git ~/nvim-config
+sh ~/nvim-config/install.sh
+nvim
+```
+
+If `~/.config/nvim` already exists, `install.sh` will back it up and replace it.
+If it is already this repo, it will just update it with `git pull --ff-only`.
+
+## Install Neovim
+
+### Debian / Ubuntu
+
+```bash
+sudo apt update
+sudo apt install -y git neovim
+```
+
+### Arch Linux
+
+```bash
+sudo pacman -S --needed git neovim
+```
+
+### Gentoo
+
+```bash
+sudo emerge --ask dev-vcs/git app-editors/neovim
+```
+
+## Update later
+
+Run this from the installed config directory:
+
+```bash
+sh ~/.config/nvim/install.sh
+```
+
+## Notes
+
+- First run will download plugins through `lazy.nvim`.
+- The config lives in `~/.config/nvim`.