[HarfBuzz] Mai Kang Lai in Tai Tham, summary draft

[Theppitak Karoonboonyanan]

Hi again,

I have drafted a summary for Mai Kang Lai in Tai Tham as we have
discussed so far.

  http://linux.thai.net/~thep/esaan-scripts/tham-issues/mai-kang-lai.html

With this, I have also added some more evidences for Lanna I have found.
Please add if I still miss something.

Regards,
--
Theppitak Karoonboonyanan
http://linux.thai.net/~thep/