Add Soviet Anthem music disc with sound, recipe, and assets

src/main/java/net/krituximon/stalinium/Stalinium.java

@@ -2,6 +2,7 @@ package net.krituximon.stalinium;
 
 import net.krituximon.stalinium.block.ModBlocks;
 import net.krituximon.stalinium.item.ModItems;
+import net.krituximon.stalinium.sound.ModSounds;
 import org.slf4j.Logger;
 
 import com.mojang.logging.LogUtils;
@@ -41,6 +42,7 @@ public class Stalinium
 
         ModItems.register(modEventBus);
         ModBlocks.register(modEventBus);
+        ModSounds.register(modEventBus);
 
         // Register ourselves for server and other game events we are interested in.
         // Note that this is necessary if and only if we want *this* class (Stalinium) to respond directly to events.