Add nixOS/ home-manager-related files

.config/nixpkgs/home.nix

@@ -0,0 +1,29 @@
+{ config, pkgs, ... }:
+
+let
+  # Be able to use unstable packages
+  pkgsUnstable = import <nixpkgs-unstable> {};
+
+in
+{ # Required
+  programs.home-manager.enable = true;
+  home.username = "earne";
+  home.homeDirectory = "/home/earne";
+
+  home.packages = with pkgs; [
+    gitFull
+    pkgsUnstable.neovim
+    tmux
+    yadm
+  ];
+
+  # This value determines the Home Manager release that your
+  # configuration is compatible with. This helps avoid breakage
+  # when a new Home Manager release introduces backwards
+  # incompatible changes.
+  #
+  # You can update Home Manager without changing this value. See
+  # the Home Manager release notes for a list of state version
+  # changes in each release.
+  home.stateVersion = "21.05";
+}

.nix-channels

@@ -0,0 +1,2 @@
+https://github.com/nix-community/home-manager/archive/release-21.05.tar.gz home-manager
+https://nixos.org/channels/nixos-unstable nixpkgs-unstable