Add data structures, it requires tons of refactor but it's more or less working

pkg/data/stat/immune.go

@@ -0,0 +1,10 @@
+package stat
+
+type Resist string
+
+const (
+	ColdImmune   Resist = "cold"
+	FireImmune   Resist = "fire"
+	LightImmune  Resist = "light"
+	PoisonImmune Resist = "poison"
+)