feat: add Homebrew formula for nutshell installation and update README

Author: chandralegend

README.md

@@ -33,6 +33,16 @@ make
 
 ### Installing 
 
+#### Via Homebrew (macOS & Linux)
+```bash
+# If using the formula directly
+brew install --build-from-source ./nutshell.rb
+
+# If using the tap (Note: This tap is not yet available)
+brew tap chandralegend/nutshell
+brew install nutshell
+```
+
 #### System-wide installation (requires sudo)
 ```bash
 sudo make install

nutshell.rb

@@ -0,0 +1,65 @@
+class Nutshell < Formula
+  desc "Enhanced Unix shell with simplified command language and AI assistance"
+  homepage "https://github.com/chandralegend/nutshell"
+  url "https://github.com/chandralegend/nutshell/archive/refs/tags/v0.0.4.tar.gz"
+  sha256 "d3cd4b9b64fb6d657195beb7ea9d47a193ace561d8d54b64e9890304e41c6829"
+  license "MIT"
+  head "https://github.com/chandralegend/nutshell.git", branch: "main"
+
+  depends_on "pkg-config" => :build
+  depends_on "jansson"
+  depends_on "readline"
+  depends_on "openssl@3"
+  depends_on "curl"
+  
+  def install
+    # Pass correct environment variables to find libraries
+    ENV.append "CFLAGS", "-I#{Formula["jansson"].opt_include}"
+    ENV.append "LDFLAGS", "-L#{Formula["jansson"].opt_lib} -ljansson"
+    ENV.append "CFLAGS", "-I#{Formula["openssl@3"].opt_include}"
+    ENV.append "LDFLAGS", "-L#{Formula["openssl@3"].opt_lib}"
+    
+    system "make"
+    bin.install "nutshell"
+    
+    # Install documentation
+    doc.install "README.md", "CHANGELOG.md"
+    
+    # Create themes directory and install themes directly in the Cellar
+    # The themes directory will be in the Formula's prefix, not in /usr/local/share
+    themes_dir = prefix/"themes"
+    themes_dir.mkpath
+    Dir["themes/*.json"].each do |theme_file|
+      themes_dir.install theme_file
+    end
+    
+    # Create a nutshell config directory in the Formula's prefix for packages
+    (prefix/"packages").mkpath
+  end
+
+  def post_install
+    # Create ~/.nutshell directory structure for the user if it doesn't exist
+    user_config_dir = "#{Dir.home}/.nutshell"
+    user_themes_dir = "#{user_config_dir}/themes"
+    user_packages_dir = "#{user_config_dir}/packages"
+    
+    system "mkdir", "-p", user_themes_dir
+    system "mkdir", "-p", user_packages_dir
+    
+    # Copy themes to user directory if it doesn't already have them
+    if Dir.exist?(user_themes_dir) && Dir.empty?(user_themes_dir)
+      Dir["#{prefix}/themes/*.json"].each do |theme|
+        system "cp", theme, user_themes_dir
+      end
+    end
+    
+    # Print instructions for the user
+    ohai "Nutshell has been installed!"
+    opoo "Make sure to set an API key for AI features with: set-api-key YOUR_API_KEY"
+  end
+
+  test do
+    # Test that nutshell runs without errors (--help should return 0)
+    assert_match "Nutshell", shell_output("#{bin}/nutshell --help", 0)
+  end
+end