add Q&A
update index
update TODO
update TODO
add changelog.rst
update doc
Merge branch 'add-q-and-a' of https://github.com/sealhuang/FreeROI into add-q-and-a

* 'add-q-and-a' of https://github.com/sealhuang/FreeROI:
  add changelog.rst
update Q&A
update doc
Merge pull request #10 from sealhuang/add-q-and-a

Add q and a