The container provides xerpi's vitahelloworld sample code in /opt/vita-toolchain/arm-vita-eabi/usr/samples/src/vitahelloworld
You can test if the toolchain works with the vita-testsuite command (execute it in a test dir)
Share your workdir with container's /home/workdir and start coding !
Example: docker run -ti -v <your_workdir>:/home/workspace --name=vita-tool bullekeup/arch-vita-toolchain