environmental citybuilder prototype

Cat Flynn 989cd8f3c9 extract build mode to class #5		2022-12-09 00:37:47 +00:00
half-earth	extract build mode to class #5	2022-12-09 00:37:47 +00:00
.gitignore	add gitignore	2022-12-03 16:26:13 +00:00
gdd.md	change to build mode with keyboard shortcuts #5	2022-12-09 00:37:47 +00:00