JDBC test
create 3 packages to implement MVC

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
initialize project structure

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
initial version of DBConnector.java

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>
DBConnector.java version 1.0

finish:
connect()
query()
update()
test successfully

Signed-off-by: jsxhhyf <jsxhhyf@gmail.com>