Copy example entry for myself
Modify helloworld.c to print my name next to the current day
Rebuild helloworld.bin based on the new code

$ file helloworld.bin
helloworld.bin: ELF 32-bit LSB  executable, ARM, EABI5 version 1 (SYSV),
statically linked, for GNU/Linux 2.6.31,
BuildID[sha1]=ba1ee4993ab9c2cacf5a11b0cd7e73f2039ac606, not stripped
Improve Makefile, supporting CROSS_COMPILE env variable
Update documentation