Add coin sound (CC0) by greenvwbeetle...

https://freesound.org/s/423332/

README.md

@@ -21,6 +21,7 @@ As of right now, only sounds from *default* mod have been added.
 | [apple_bite][]               | sonicmariobrotha         | CC0          |                         |
 | [bird*][bird]                | Jc Guan                  | CC0          |                         |
 | [boing][]                    | reelworldstudio          | CC0          |                         |
+| [coin][]                     | greenvwbeetle            | CC0          |                         |
 | [cow_moo*][cow_moo]          | JosephSardin             | CC0          |                         |
 | [dig_choppy.*][dig_choppy]   | Sheyvan                  | CC0          |                         |
 | [dig_cracky.*][dig_cracky]   | Benboncan                | CC BY 3.0    |                         |
@@ -101,6 +102,7 @@ default.node_sound_dirt_defaults = sounds.node_dirt
 [apple_bite]: https://freesound.org/s/333825/
 [bird]: https://soundbible.com/340-Bird-Song.html
 [boing]: https://freesound.org/s/161122/
+[coin]: https://freesound.org/s/423332/
 [cow_moo]: https://freesound.org/s/177253/
 [glass_break.1]: https://freesound.org/s/71947/
 [glass_break.2]: https://freesound.org/s/97669/

TODO.txt

@@ -5,7 +5,6 @@ TODO:
 - normalize sound files
 - document node sound groups
 - add more sounds:
-	- coins
 	- hit/damage
 	- tool breaks
 	- lava cool

changelog.txt

@@ -6,6 +6,7 @@ next
 	- apple_bite
 	- bird
 	- bounce
+	- coins
 	- cow_moo
 	- explosion
 	- fuse

main.lua

@@ -249,6 +249,14 @@ sounds.bounce = SoundGroup({
 	"boing",
 })
 
+--- Coin sounds.
+--
+--  @sndgroup sounds.coin
+--  @snd coin
+sounds.coin = SoundGroup({
+	"coin",
+})
+
 --- Cow moo sounds.
 --
 --  @sndgroup sounds.cow_moo