Add gsm cells download script
-rw-r--r-- 23 .gitignore
-rw-r--r-- 1191 LICENSE
-rw-r--r-- 1410 Makefile
drwxr-xr-x - config
-rw-r--r-- 285 default.nix
drwxr-xr-x - docs
drwxr-xr-x - environments
drwxr-xr-x - lib
drwxr-xr-x - modules
drwxr-xr-x - nixops
drwxr-xr-x - overlays
drwxr-xr-x - pkgs
drwxr-xr-x - scripts