Add README template for generator output

This adds a helpful README template that's displayed after successful generator installation, providing users with clear next steps and examples of how to use the generated models.

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

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

Author: kieranklaassen

lib/generators/ruby_llm/install/templates/README.md

@@ -0,0 +1,55 @@
+# RubyLLM Rails Setup Complete!
+
+Thanks for installing RubyLLM in your Rails application. Here's what was created:
+
+## Models
+
+- `Chat` - Stores chat sessions and their associated model ID
+- `Message` - Stores individual messages in a chat
+- `ToolCall` - Stores tool calls made by language models
+
+## Next Steps
+
+1. **Run migrations:**
+   ```bash
+   rails db:migrate
+   ```
+
+2. **Set your API keys** in `config/initializers/ruby_llm.rb` or using environment variables:
+   ```ruby
+   # config/initializers/ruby_llm.rb
+   RubyLLM.configure do |config|
+     config.openai_api_key = ENV["OPENAI_API_KEY"]
+     config.anthropic_api_key = ENV["ANTHROPIC_API_KEY"]
+     # etc.
+   end
+   ```
+
+3. **Start using RubyLLM in your code:**
+   ```ruby
+   # Create a new chat
+   chat = Chat.create!(model_id: "gpt-4o-mini")
+   
+   # Ask a question
+   response = chat.ask("What's the best Ruby web framework?")
+   
+   # Get chat history
+   chat.messages
+   ```
+
+4. **For streaming responses** with ActionCable or Turbo:
+   ```ruby
+   chat.ask("Tell me about Ruby on Rails") do |chunk|
+     Turbo::StreamsChannel.broadcast_append_to(
+       chat, target: "response", partial: "messages/chunk", locals: { chunk: chunk }
+     )
+   end
+   ```
+
+## Advanced Usage
+
+- Add more fields to your models as needed
+- Customize the views to match your application design
+- Create a controller for chat interactions
+
+For more information, visit the [RubyLLM Documentation](https://github.com/crmne/ruby_llm)

spec/lib/generators/ruby_llm/template_files_spec.rb

@@ -86,6 +86,22 @@
     end
   end
 
+  describe "README template" do
+    it "has a README template file" do
+      expect(File.exist?(File.join(template_dir, "README.md"))).to be(true)
+    end
+    
+    it "has helpful post-installation instructions" do
+      readme_content = File.read(File.join(template_dir, "README.md"))
+      expect(readme_content).to include("RubyLLM Rails Setup Complete")
+      expect(readme_content).to include("Run migrations")
+      expect(readme_content).to include("rails db:migrate")
+      expect(readme_content).to include("Set your API keys")
+      expect(readme_content).to include("Start using RubyLLM in your code")
+      expect(readme_content).to include("For streaming responses")
+    end
+  end
+  
   describe "generator file structure" do
     it "has proper directory structure" do
       generator_file = "/Users/kieranklaassen/rails/ruby_llm/lib/generators/ruby_llm/install_generator.rb"
@@ -97,6 +113,7 @@
       expect(generator_content).to include("def create_migration_files")
       expect(generator_content).to include("def create_model_files")
       expect(generator_content).to include("def create_initializer")
+      expect(generator_content).to include("def show_readme")
     end
 
     it "creates migrations in the correct order" do