[1] Use "cd" command to go to the iCalendar src folder
 
[2] Use "make" command to makefile, use "make clean" to clean generated files.

[3] Type "./ica", there are 4 options to choose.
	-a  print AST
	-c  compile
 	-v  show version
	-h  help

[4] To run an iCalendar language code, type ./ica -c FILE.ica
    If the test file is not in the same folder(src), you could use:
    ./ica -c yourfolder/FILE.ica

[5] Use java FILE to generate executable code.
