README.md in 3 languages, with detailed instructions

[ChrisTorng]

No description provided.

[ChrisTorng]

I'm not familiar with GitHub's Pull Request. I don't know why my 2 PRs have been merged into one. And the changes in pde has only two lines on:

MidiBus.list(); // 啟動時會列出 MIDI Input/Output 裝置，記下你想用的 MIDI Input 裝置名稱，設定在下一行。
myBus = new MidiBus(this, "MIDI Input device name", -1); // 將「MIDI Input device name」代換成你的 MIDI Input 裝置。

But before commit, I have checked the changes in IDE has only the two lines. Maybe because of different line endings (CR/LF)?

[ChrisTorng]

Add the instruction on Windows to sharing MIDI Input device between MIDI app and PianoVirtualizer.

[ChrisTorng]

Now all the instructions are pretty long. I suggest to keep current README.md in English, with two links to README_zhcht.md and README_zhchs.md. Or start using Wiki section to collect detailed instructions?