Cleaned up audio code

src/Discord.Net.Core/Audio/AudioInStream.cs

@@ -1,8 +1,30 @@
-using System.IO;
+using System;
+using System.IO;
+using System.Threading;
 
 namespace Discord.Audio
 {
     public abstract class AudioInStream : Stream
     {
+        public override bool CanRead => true;
+        public override bool CanSeek => false;
+        public override bool CanWrite => true;
+
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            WriteAsync(buffer, offset, count, CancellationToken.None).GetAwaiter().GetResult();
+        }
+
+        public override void Flush() { throw new NotSupportedException(); }
+
+        public override long Length { get { throw new NotSupportedException(); } }
+        public override long Position
+        {
+            get { throw new NotSupportedException(); }
+            set { throw new NotSupportedException(); }
+        }
+
+        public override void SetLength(long value) { throw new NotSupportedException(); }
+        public override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
     }
 }