(feat) Added hello Ingot.
(feat) Added hello example.
(doc) Enhanced README.
Merge pull request #3 from zzmp/doc/README

(doc) Enhance README.
(feat) Enhanced Ingot and example for canonical use.
(doc) Moved TARGET comment in configure script.
Merge pull request #1 from zzmp/feat/hello

(feat) Added hello Ingot and example.
(bug) Return Unwind on Err.