write write_file in file_system_main.h and file_calls
Merge branch 'file_system' of github.com:tadas412/PennOS into file_system
Merge branch 'file_system' of github.com:tadas412/PennOS into file_system
Merge branch 'file_system' of github.com:tadas412/PennOS into file_system
write close_file, free_descriptor
write some free functions