environmental citybuilder prototype

ktyl 63f7984cd7 tile-health (#18) ... Reviewed-on: #18		2022-12-21 23:54:12 +01:00
half-earth	tile-health (#18)	2022-12-21 23:54:12 +01:00
.gitignore	add gitignore	2022-12-03 16:26:13 +00:00
gdd.md	heat (#16)	2022-12-13 01:54:54 +01:00