added temp scene and wave based enemy

Assets/Darkmatter/Code/Core/Contracts/Services/IAudioService.cs

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+using UnityEngine;
+
+namespace Darkmatter.Core
+{
+    public interface IAudioService
+    {
+        void PlayMusic(AudioId id);
+        void StopMusic();
+
+        void PlaySFX(AudioId id,float volume);
+        void PlaySFXAt(AudioId id, UnityEngine.Vector3 position);
+    }
+}

Assets/Darkmatter/Code/Core/Contracts/Services/IAudioService.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ad5ce615be52e274db215ee4a11cf0e4