Add silverfish sounds (thanks, Inocodum!)

mods/ENTITIES/mobs_mc/LICENSE-media.md

@@ -167,5 +167,10 @@ Origin of those models:
 * [ebcrosby](https://freesound.org/people/ebcrosby/)
     * `mobs_mc_ocelot_hurt.ogg` (CC BY 3.0)
         * Source: <https://freesound.org/people/ebcrosby/sounds/332979/>
+* [Inocodum](https://forum.minetest.net/memberlist.php?mode=viewprofile&u=3115)
+    * `mobs_mc_silverfish_hurt.ogg` (CC BY-SA 4.0)
+    * `mobs_mc_silverfish_death.ogg` (CC BY-SA 4.0)
+    * `mobs_mc_silverfish_idle.ogg` (CC BY-SA 4.0)
+        * Source: <https://forum.minetest.net/viewtopic.php?f=17&t=10013>
 
 Note: Many of these sounds have been more or less modified to fit the game.

mods/ENTITIES/mobs_mc/silverfish.lua

@@ -21,7 +21,12 @@ mobs:register_mob("mobs_mc:silverfish", {
 	},
 	pathfinding = 1,
 	visual_size = {x=3, y=3},
-	-- TODO: sounds
+	sounds = {
+		random = "mobs_mc_silverfish_idle",
+		death = "mobs_mc_silverfish_death",
+		damage = "mobs_mc_silverfish_hurt",
+		distance = 16,
+	},
 	makes_footstep_sound = false,
 	walk_velocity = 0.6,
 	run_velocity = 2,