Added a rain layer for atmosphere.

assets/imagebank.go

@@ -30,6 +30,7 @@ const (
 	Splash        ImgAssetName = "Splash"
 	LaserBeam     ImgAssetName = "LaserBeam"
 	ItemLaser     ImgAssetName = "ItemLaser"
+	RainSplash    ImgAssetName = "RainSplash"
 )
 
 var (
@@ -69,6 +70,8 @@ var (
 	laserbeam_img []byte
 	//go:embed item-laser.png
 	itemlaser_img []byte
+	//go:embed rain-splash.png
+	rainsplash_img []byte
 )
 
 func LoadImages() {
@@ -91,6 +94,7 @@ func LoadImages() {
 	ImageBank[Splash] = LoadImagesFatal(splash_img)
 	ImageBank[LaserBeam] = LoadImagesFatal(laserbeam_img)
 	ImageBank[ItemLaser] = LoadImagesFatal(itemlaser_img)
+	ImageBank[RainSplash] = LoadImagesFatal(rainsplash_img)
 
 }