Start rts thing

build/rtsgame/array.core

@@ -0,0 +1,15 @@
+#import "LibC.core"
+
+Array :: struct($T: Type)
+  data: *T
+  len: int
+  cap: int
+
+Add :: (a: *Array($T), item: T)
+  if a.cap == 0
+    a.cap = 16
+    a.data = malloc(SizeOf(T) * a.cap->U64)
+  if a.len + 1 > a.cap
+    a.cap *= 2
+    a.data = realloc(a.data, SizeOf(T) * a.cap->U64)
+  a.data[a.len++] = item