Adding path to repo

You can use it with express like following :
```
const path = require('path');
const express = require('express');
const app = express();
const Server = require('node-git-server');

const repos = new Server(path.resolve(__dirname, 'tmp'), {
autoCreate: true
});
const port = process.env.PORT || 7005;

app.use('/git', function(req, res) {
repos.handle(req, res)
});

app.listen(7005, () => {
console.log(`Express http server listening`);
});
```
Is this what you want ?

_Originally posted by @esp10mm in https://github.com/gabrielcsapo/node-git-server/issues/58#issuecomment-522491841_

I am getting errors like :
const u = url_1.default.parse(req?.url || '');
^

SyntaxError: Unexpected token '.'

从 issue 中的 Express 使用示例和报告的错误 `url_1.default.parse(req?.url || '')` 开始。跟踪相关的入口点并验证受支持的 Node.js 运行时；当文档中的 Express 设置能够在不出现所报告的语法错误的情况下运行时，即视为完成。

由索引模型根据 Issue 内容生成。