Installer script for MacOS

I wonder if we would care to have an installer as shell script? Since you have a compiling.md I imagine you don't :)

Either way, Here's mine for MacOS.

#!/usr/bin/env bash
set -euo pipefail

# --- Configuration ---
REPO_URL="https://github.com/StrikerX3/Ymir.git"
REPO_DIR="Ymir"
VCPKG_DIR="vcpkg"
BUILD_DIR="build"

# --- Helper Functions ---
command_exists() { command -v "$1" >/dev/null 2>&1; }

echo ">>> Detecting macOS architecture..."
ARCH=$(uname -m)
echo "Architecture: $ARCH"

echo ">>> Checking for Homebrew..."
if ! command_exists brew; then
  echo "Homebrew not found. Installing..."
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
fi

echo ">>> Installing dependencies via Homebrew..."
brew install cmake ninja || true

echo ">>> Checking for Xcode Command Line Tools..."
if ! xcode-select -p >/dev/null 2>&1; then
  echo "Installing Xcode Command Line Tools..."
  xcode-select --install
fi

echo ">>> Cloning Ymir (dev branch)..."
if [ ! -d "$REPO_DIR" ]; then
  git clone -b dev --recurse-submodules "$REPO_URL" "$REPO_DIR"
else
  echo "Repo already exists, skipping clone."
fi

echo ">>> Bootstrapping vcpkg..."
if [ ! -d "$VCPKG_DIR" ]; then
  git clone https://github.com/microsoft/vcpkg.git "$VCPKG_DIR"
  (cd "$VCPKG_DIR" && ./bootstrap-vcpkg.sh)
fi

echo ">>> Configuring CMake build..."
cmake -S "$REPO_DIR" -B "$REPO_DIR/$BUILD_DIR" -G Ninja \
  -DCMAKE_TOOLCHAIN_FILE="../$VCPKG_DIR/scripts/buildsystems/vcpkg.cmake" \
  -DCMAKE_BUILD_TYPE=Release \
  -DYmir_ENABLE_DEVLOG=OFF \
  -DYmir_ENABLE_IMGUI_DEMO=OFF \
  -DYmir_EXTRA_INLINING=ON

echo ">>> Building Ymir..."
if [ "$ARCH" = "arm64" ]; then
  cmake --build "$REPO_DIR/$BUILD_DIR" --parallel
else
  cmake --build "$REPO_DIR/$BUILD_DIR"
fi

APP_PATH="$REPO_DIR/$BUILD_DIR/apps/ymir-sdl3/ymir-sdl3.app"
TARGET_APP="/Applications/Ymir.app"

echo ">>> Copying app bundle to $TARGET_APP..."
sudo rm -rf "$TARGET_APP" 2>/dev/null || true
sudo cp -r "$APP_PATH" "$TARGET_APP"

echo ">>> Installation complete!"
echo "Note: Ymir requires a valid IPL (BIOS) ROM to work."
echo "You can now launch Ymir via Spotlight, Launchpad, or..."
echo "  open /Applications/Ymir.app"