add CP950 (BIG5) table

[wychi]

Hi ashtuchkin,

Thank for you efforts on iconv-lite

I just add a BIG5->Unicode table.
if you are interesting, you can merge it.

[ashtuchkin]

Thanks a lot! Could you also make some tests, like its done for GBK? Maybe several web pages using Big5?

[david50407]

it works! https://i.imgur.com/nUZZqUp.png