docs: add readme for cli usage

[hustcc]

CLI Usage

We also provide a CLI tool for easy usage in your terminal, Install globally:

npm install -g chart-visualization-skills

Retrieve or list skills by query:

# Retrieve skills by query
chart-visualization-cli retrieve "bar chart" --library g2 --topk 10

# List all available skills
chart-visualization-cli list --library g2 --category core

Usage for the command:

Usage: chart-visualization-cli [options] [command]

CLI tool for AntV chart visualization skills retrieval

Options:
  -V, --version               output the version number
  -h, --help                  display help for command

Commands:
  retrieve [options] <query>  Search for skills matching a query
  list [options]              List all available skills
  help [command]              display help for command

API Usage

import { retrieve } from 'chart-visualization-skills';

const skills = retrieve('bar chart', 'g2', 5);

Parameter	Type	Default	Description
query	string	—	Search query
library	string	'g2'	Library filter (g2 or g6)
topk	number	7	Number of results

[gemini-code-assist]

Code Review

This pull request updates the README.md file. It renames 'g2-chart' to 'antv-g2-chart' for consistency and introduces new sections detailing CLI and API usage, complete with installation instructions, command examples, and an API example with a parameter table. The review feedback suggests minor improvements to the README.md for clarity and best practices, including refining a markdown heading, adding a language identifier to a code block, simplifying an API usage example to leverage default parameters, and ensuring the file ends with a newline character.

[gemini-code-assist]

There's a leading space in this markdown heading which should be removed. Also, the title Usage for the command is a bit vague. Consider changing it to something more descriptive like Command Help Output to clarify that the following block shows the output of the help command.

Suggested change

	**Usage for the command**:
	**Command Help Output**:

[gemini-code-assist]

For better syntax highlighting and accessibility, it's good practice to add a language identifier to fenced code blocks. For this block, which contains command-line help text, text would be appropriate.

Suggested change

	```
	```text

[gemini-code-assist]

The current API usage example retrieve('bar chart', 'g2', 5) is correct, but since 'g2' is the default library, the example could be simplified to better showcase the use of default parameters. Using retrieve('bar chart') would be a more concise example that relies on both default library and topk values, which are documented in the table below.

Suggested change

	const skills = retrieve('bar chart', 'g2', 5);
	const skills = retrieve('bar chart');

[gemini-code-assist]

The file is missing a newline character at the end. It's a common convention to end files with a newline to prevent issues with file concatenation and some command-line tools.

Suggested change

	MIT License - see the [LICENSE](LICENSE) file for details.
	MIT License - see the [LICENSE](LICENSE) file for details.