Initial commit: Add setup script and Dotter skill

Add Homebrew-based setup script that installs development tools and
Dotter configuration manager. Script supports both macOS and Linux,
with platform-specific handling for casks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/skills/dotter/SKILL.md

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+---
+name: dotter-docs
+description: Reference Dotter documentation
+---
+
+# Dotter Docs
+
+## Instructions
+
+Reference the files in `dotter.wiki` when you need information on how to use Dotter.
+
+dotter.wiki
+├── 1.-Getting-Started.md
+├── 2.-Symbolic-links-and-Templates.md
+├── 3.-Packages-and-`local.toml`.md
+├── 4.-Complex-Target.md
+├── 5.-Built‐ins,-Helpers,-and-Settings.md
+├── 6.-Miscellaneous-features.md
+├── FAQ-&-Troubleshooting.md
+└── Home.md
+
+## Examples
+
+Find how to install:
+
+```
+rg -C4 'install'
+```
+

.claude/skills/dotter/dotter.wiki

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+Subproject commit 9195aa11bbe843e4607c3974c442942377fd5995

.gitmodules

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+[submodule ".claude/skills/dotter/dotter.wiki"]
+	path = .claude/skills/dotter/dotter.wiki
+	url = https://github.com/SuperCuber/dotter.wiki.git

setup.sh

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+#!/usr/bin/env bash
+
+set -e
+
+echo "Setting up dotfiles environment..."
+
+# Detect OS
+OS="$(uname -s)"
+
+# Check if Homebrew is installed
+if ! command -v brew &> /dev/null; then
+    echo "Homebrew is not installed. Please install it first:"
+    echo "https://brew.sh"
+    exit 1
+fi
+
+echo "Updating Homebrew..."
+brew update
+
+# Install packages (available on both macOS and Linux)
+PACKAGES=(
+    dotter
+    fish
+    dust
+    eza
+    htop
+    go
+    jq
+    lazygit
+    neovim
+    asdf
+    bat
+    pandoc
+    ripgrep
+    zoxide
+    zellij
+    p7zip
+)
+
+echo "Installing packages..."
+for package in "${PACKAGES[@]}"; do
+    if brew list "$package" &>/dev/null; then
+        echo "✓ $package already installed"
+    else
+        echo "Installing $package..."
+        brew install "$package"
+    fi
+done
+
+# Install casks on macOS only
+if [[ "$OS" == "Darwin" ]]; then
+    echo "Installing macOS-specific casks..."
+
+    CASKS=(
+        font-fira-code-nerd-font
+        orbstack
+    )
+
+    for cask in "${CASKS[@]}"; do
+        if brew list --cask "$cask" &>/dev/null; then
+            echo "✓ $cask already installed"
+        else
+            echo "Installing $cask..."
+            brew install --cask "$cask"
+        fi
+    done
+else
+    echo "Skipping macOS-specific casks (not on macOS)"
+fi
+
+echo "✓ Setup complete!"
+echo ""
+echo "Next steps:"
+echo "  1. Run 'dotter deploy' to deploy your dotfiles"
+echo "  2. Consider setting fish as your default shell: chsh -s \$(which fish)"