environmental citybuilder prototype

Cat Flynn 4b6d0d9e77 grid with gradient		2022-12-06 01:28:15 +00:00
half-earth	grid with gradient	2022-12-06 01:28:15 +00:00
.gitignore	add gitignore	2022-12-03 16:26:13 +00:00
gdd.md	add gdd	2022-12-03 16:01:14 +00:00