add README.md
add the whole project structure....
gradle script update....
add the lower layer code....
add baiji-core support and update the AsyncHttp
update the ServiceClient ....
update the AsyncHttpClient....
fix the sendRequest() issue....
AsyncHttpRequest update....
add a request retry handler....
finish the AsyncHttpRequest....
Add the RedirectHandler....
finish the AsyncResponseHandler....
remove useless code....
Add HttpEntity close implementation....
Add BinaryResponseHandler implementation....
Add the service callback....
Add JsonResponseHandler implementation....
Add BaijiServiceClient....
remove the useless BinaryResponseHandler....