Add PHP support

[sohaha]

目前 leetcode 是支持 php 的了，能否考虑加上？
（不加其实也没事，估计也没 写 php 的会用吧🙅‍♂️，逃）

[poppinlp]

@sohaha Hi
This feature depends on the leetcode-cli package.
I've sent a PR for PHP supporting and we'll support it after they merge and release. :)

[jdneo]

Considering the leetcode-cli is inactive for a long time. I'm thinking to fork and publish a temporary bit for it. Because currently there are too many issues blocked.

[poppinlp]

@jdneo And maybe we should export a JS module instead of the CLI for easy using and performance reason.

[jdneo]

@poppinlp That's exactly what I'm thinking.

But exporting a JS module might cost much more time, so in the short term, publishing a forked cli bit could be a workaround. For the long term, we need a library instead of depending on the cli.

[poppinlp]

@jdneo Agree. 👍

And if you like, maybe we could create a github org to contains the JS module, the CLI based on JS module, and extensions.
And i just find out that the owner of leetcode package name is a friend of me and it's long time inactive. So maybe we could use that package name. :)

[jdneo]

@poppinlp Ok, let me think more about it and I'll let you know the update when I have more thoughts on this. Thank you for your passion. We can chat with more details in the gitter channel

[jdneo]

Resolved in #179.