Add project files.

AssetStudio/YAML/Base/YAMLNode.cs

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+namespace AssetStudio
+{
+	public abstract class YAMLNode
+	{
+		internal virtual void Emit(Emitter emitter)
+		{
+			bool isWrote = false;
+			if (!CustomTag.IsEmpty)
+			{
+				emitter.Write(CustomTag.ToString()).WriteWhitespace();
+				isWrote = true;
+			}
+			if (Anchor.Length > 0)
+			{
+				emitter.Write("&").Write(Anchor).WriteWhitespace();
+				isWrote = true;
+			}
+
+			if (isWrote)
+			{
+				if (IsMultiline)
+				{
+					emitter.WriteLine();
+				}
+			}
+		}
+
+		public abstract YAMLNodeType NodeType { get; }
+		public abstract bool IsMultiline { get; }
+		public abstract bool IsIndent { get; }
+		
+		public string Tag
+		{
+			get => CustomTag.Content;
+			set => CustomTag = new YAMLTag(YAMLWriter.DefaultTagHandle, value);
+		}
+		public YAMLTag CustomTag { get; set; }
+		public string Anchor { get; set; } = string.Empty;
+	}
+}