If you're looking for the Nintendo Seal of Quality, you're gonna have a bad time.
To build, you need to install cc65, with the executables on your path.
Then run build.sh from bash, or just run the build directly on the command line:
cl65 -C smc.cfg -o hello.smc -l hello.list hello.asm
You can then load hello.nes into the SNES/SuperFamiCom emulator of your choice. It has been tested on Linux and Windows using Snes9x. If you have an issue with any other emulator or host environment, please post an issue to this repo. Thanks!