docs: document CodeGPT commit feature and plugin usage

- Add plugin metadata for CodeGPT, including description, author, homepage, and keywords
- Introduce documentation for AI-powered git commit message generation using codegpt commit
- Document installation and usage instructions, including configuration options and workflow
- Provide examples showing language selection, template customization, and file exclusion features

Signed-off-by: appleboy <[email protected]>

Author: appleboy

.claude-plugin/plugin.json

@@ -0,0 +1,33 @@
+{
+  "name": "CodeGPT",
+  "version": "1.0.0",
+  "description": "A CLI tool for generating git commit messages and code reviews using AI. Supports multiple providers including OpenAI, Azure, Gemini, Anthropic, Ollama, Groq, and OpenRouter.",
+  "author": {
+    "name": "Bo-Yi Wu",
+    "email": "[email protected]",
+    "url": "https://github.com/appleboy"
+  },
+  "homepage": "https://github.com/appleboy/CodeGPT",
+  "repository": "https://github.com/appleboy/CodeGPT",
+  "license": "MIT",
+  "keywords": [
+    "git",
+    "commit-messages",
+    "code-review",
+    "ai",
+    "cli",
+    "openai",
+    "azure-openai",
+    "anthropic",
+    "claude",
+    "gemini",
+    "ollama",
+    "groq",
+    "openrouter",
+    "golang",
+    "git-hooks",
+    "automation",
+    "devtools",
+    "llm"
+  ]
+}

skills/git-commit-message/SKILL.md

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+---
+name: git commit message
+description: This skill provides AI-powered git commit message generation using the `codegpt commit` command. It analyzes git diffs and automatically generates conventional commit messages in multiple languages.
+---
+
+# Git Commit Message
+
+## Description
+
+The git-commit skill leverages various AI providers (OpenAI, Anthropic, Gemini, Ollama, Groq, OpenRouter) to automatically generate meaningful commit messages that follow the [Conventional Commits](https://www.conventionalcommits.org/) specification.
+
+## Installation
+
+Run the install script to automatically download and set up the latest release:
+
+```sh
+bash < <(curl -sSL https://raw.githubusercontent.com/appleboy/CodeGPT/main/install.sh)
+```
+
+## Usage
+
+### Basic Usage
+
+Generate a commit message for staged changes:
+
+```bash
+codegpt commit
+```
+
+### Common Options
+
+```bash
+# Preview commit message before committing
+codegpt commit --preview
+
+# Skip confirmation prompts
+codegpt commit --no_confirm
+
+# Set output language (en, zh-tw, zh-cn)
+codegpt commit --lang zh-tw
+
+# Use specific AI model
+codegpt commit --model gpt-4o
+
+# Amend previous commit
+codegpt commit --amend
+
+# Display prompt only (no API call)
+codegpt commit --prompt_only
+
+# Write to specific output file
+codegpt commit --file /path/to/commit-msg
+
+# Customize diff context lines
+codegpt commit --diff_unified 5
+
+# Exclude specific files from diff
+codegpt commit --exclude_list "*.lock,*.json"
+
+# Use custom template file
+codegpt commit --template_file ./my-template.tmpl
+
+# Use inline template string
+codegpt commit --template_string "{{.summarize_prefix}}: {{.summarize_title}}"
+
+# Set API timeout
+codegpt commit --timeout 60s
+
+# Configure network proxy
+codegpt commit --proxy http://proxy.example.com:8080
+codegpt commit --socks socks5://127.0.0.1:1080
+```
+
+### Template Variables
+
+When using custom templates, the following variables are available:
+
+- `{{.summarize_prefix}}` - Conventional commit prefix (feat, fix, docs, etc.)
+- `{{.summarize_title}}` - Brief commit title
+- `{{.summarize_message}}` - Detailed commit message body
+
+You can also provide custom variables:
+
+```bash
+codegpt commit --template_vars "author=John,ticket=PROJ-123"
+codegpt commit --template_vars_file ./vars.env
+```
+
+## Workflow
+
+1. **Diff Analysis**: Analyzes staged changes using `git diff`
+2. **Summarization**: AI generates a summary of the changes
+3. **Title Generation**: Creates a concise commit title
+4. **Prefix Detection**: Determines appropriate conventional commit prefix
+5. **Message Composition**: Combines all elements into a formatted message
+6. **Translation** (optional): Translates to target language if specified
+7. **Preview & Confirmation**: Shows message for review and optional editing
+8. **Commit**: Records changes to the repository
+
+## Configuration
+
+Configure via `~/.config/codegpt/.codegpt.yaml`:
+
+```yaml
+openai:
+  provider: openai  # or: azure, anthropic, gemini, ollama, groq, openrouter
+  api_key: your_api_key_here
+  model: gpt-4o
+  timeout: 30s
+
+git:
+  diff_unified: 3
+  exclude_list: []
+  template_file: ""
+  template_string: ""
+
+output:
+  lang: en  # or: zh-tw, zh-cn
+  file: ""
+```
+
+## Examples
+
+### Example 1: Basic commit with preview
+
+```bash
+# Stage your changes
+git add .
+
+# Generate and preview commit message
+codegpt commit --preview
+```
+
+### Example 2: Chinese commit message
+
+```bash
+codegpt commit --lang zh-tw --model gpt-4o
+```
+
+### Example 3: Custom template
+
+```bash
+codegpt commit \
+  --template_string "[{{.summarize_prefix}}] {{.summarize_title}}" \
+  --template_vars "ticket=PROJ-123"
+```
+
+### Example 4: With file exclusions
+
+```bash
+codegpt commit \
+  --exclude_list "package-lock.json,yarn.lock,go.sum" \
+  --preview
+```
+
+## Tips
+
+1. **Stage Changes First**: Always run `git add` before using `codegpt commit`
+2. **Use Preview Mode**: Review messages with `--preview` before committing
+3. **Customize Templates**: Create templates that match your team's commit style
+4. **Set Default Language**: Configure your preferred language in config file
+5. **Exclude Generated Files**: Use `--exclude_list` to ignore lock files and generated code