Support php

[poppinlp]

Add supporting for php since leetcode supports it right now.

[sunznx]

我用 php 啊，帮忙合并下 - -

[poppinlp]

@sunznx 这个之前已经在我们 fork 的版本中更新了 https://github.com/leetcode-tools/leetcode-cli
extension 的 language 选择中我稍后加入 php

[poppinlp]

@skygragon Hi.
I'm pretty happy that you get back here. :)
We've forked a repo here some times ago in our org to do some patches. And it's a really important lib for our vscode leetcode plugin.
I think maybe we could get together to maintain a core lib and a CLI lib. That sounds exciting. What do you think about it? :)