Add argument for removing metadata

FFMpegCore/FFMPEG/Argument/Atoms/RemoveMetadataArgument.cs

@@ -0,0 +1,17 @@
+namespace FFMpegCore.FFMPEG.Argument
+{
+    /// <summary>
+    /// Remove metadata argument
+    /// </summary>
+    public class RemoveMetadataArgument : Argument
+    {
+        public RemoveMetadataArgument()
+        {
+        }
+
+        public override string GetStringValue()
+        {
+            return $"-map_metadata -1 ";
+        }
+    }
+}