Merge pull request #1 from alex0367/master

Add readme for future installation and run need.
begin to port newlib
remove new lib
add tool chain
init toolchain port env
add toolchains
add runtime
delete
change user program into dynamic link
Merge branch 'master' of https://github.com/crazyender/mos
Merge branch 'master' of https://github.com/crazyender/mos
delete unused file
Merge branch 'master' of https://github.com/crazyender/mos