Add README-CN.md

[EchoHou2000]

Would you consider adding a Chinese version to the README.md , this will make it easier for Chinese developers to participate in the project, if possible, I can do this work.

[sanjaypujare]

That sounds like a good idea. However how do we keep that up to date and in sync with the main README.md on an ongoing basis? CC @ejona86

[ejona86]

We're not 100% certain we want this, but it seems fair. The main concerns are maintenance after the initial contribution and the fact our other documentation (like grpc.io) is not translated and would be much more work. In some ways, the README isn't the most important thing to translate.

We are looking at reworking our existing README to make it more on-point and making it easier to maintain as we make new releases. So it is probably best to delay this until March-ish when we'll hopefully have reworked the README.