add hydrogen config

hydrogen.darwin.nix

@@ -0,0 +1,52 @@
+{ pkgs, inputs, ... }: {
+  nixpkgs.config.allowUnfree = true;
+  nixpkgs.overlays = [ inputs.nix-vscode-extensions.overlays.default ];
+  ids.gids.nixbld = 350;
+  security.pam.services.sudo_local.touchIdAuth = true;
+
+  # 1Password SSH Socket
+  environment.variables.SSH_AUTH_SOCK = "~/Library/Group Containers/2BU8OCWD5C.com.1password/t/agent.sock";
+
+  # Set vim as default editor
+  environment.variables.EDITOR = "vim";
+  environment.variables.VISUAL = "vim";
+  environment.variables.GIT_EDITOR = "vim";
+
+  # Add Homebrew to PATH
+  environment.systemPath = [ "/opt/homebrew/bin" "/opt/homebrew/sbin" ];
+
+  # Biome config
+  environment.etc."biome.json".source = ./config.biome.json;
+  environment.etc."oxlintrc.json".source = ./config.oxlintrc.json;
+
+  system.primaryUser = "mbessette";
+  users.users."mbessette" = {
+    name = "mbessette";
+    home = "/Users/mbessette";
+  };
+
+  # Homebrew for Casks and specific binaries
+  # In a nix-darwin setup, Homebrew packages are not actually stored inside the Nix store. 
+  # Instead, nix-darwin acts as a manager that triggers the standard Homebrew installation 
+  # process on your macOS system.
+  homebrew = {
+    enable = true;
+    onActivation.cleanup = "uninstall";
+    onActivation.autoUpdate = true;
+    onActivation.upgrade = true;
+    taps = [ "bufbuild/buf" "jacobjohansen/tap" ];
+    brews = [
+      "biome"
+    ];
+    casks = [
+      "1password"
+      "iterm2"
+      "obsidian" 
+      "signal" 
+      "spotify"
+    ];
+  };
+
+  nix.settings.experimental-features = "nix-command flakes";
+  system.stateVersion = 4;
+}