add a line in readme.md

  Changes to be committed:
 	modified:   readme.md
merge dev branch
add hello.c file

  Changes to be committed:
 	new file:   hello.c
merge dev branch, again
add speak.c

  Changes to be committed:
 	new file:   speak.c
add a note to this project

  Changes to be committed:
 	new file:   note.txt
new feature