docs: add a logo

README.md

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 **[中文](./README_zh.md) | English**
 
 # Leetgo
-
+ 
 [![Go Report Card](https://goreportcard.com/badge/github.com/j178/leetgo)](https://goreportcard.com/report/github.com/j178/leetgo)
 [![CI](https://github.com/j178/leetgo/actions/workflows/ci.yaml/badge.svg)](https://github.com/j178/leetgo/actions/workflows/ci.yaml)
 [![GitHub downloads](https://img.shields.io/github/downloads/j178/leetgo/total)](https://github.com/j178/leetgo/releases)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://makeapullrequest.com)
 [![Twitter Follow](https://img.shields.io/twitter/follow/niceoe)](https://twitter.com/niceoe)
+<img align="right" height=150 src="https://github.com/j178/leetgo/assets/10510431/4dbe3a58-6c64-4b54-a695-78c7d8c8de39" />
 
 `leetgo` is a command-line tool for LeetCode that provides almost all the functionality of LeetCode,
 allowing you to do all of your LeetCode exercises without leaving the terminal.