These are various configuration files for many components of linux. As of writing this (October 8, 2016), this repository just hosts kernel configs for building customized kernels.
The config files are stored under master. As configs get refined, they'll be tagged for the version of the Linux kernel that they apply to, plus my own "-rc-n" release candidate number.
The directory structure is as follows: kernel/<arch>/<bits>/<cpu_type>/<hardware_profile>_config