Add a README.chromium and LICENSE file for Strongtalk assembler.

This allows the Chromium license tool to automatically include
Strongtalk in about:credits.

BUG= None
TEST= Strongtalk section in Chrome's about:credits
R= ager

Codereview URL: http://codereview.chromium.org/6357004/

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6354 ce2b1a6d-e550-0410-aec6-3dcde31c8c00