add doxygen files
Merge branch 'master' of git://github.com/projectNe10/Ne10 into documents
build the frame work of documents with doxygen
add notes and image for doxygen
move information of USAGE.txt to documentations of doxygen
change the URL for New BSD License
Merge pull request #42 from projectNe10/dev/yangzhang/documents

build documentation with doxygen