Add project files.

AssetStudio/YAML/Base/YAMLDocument.cs

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+namespace AssetStudio
+{
+	public sealed class YAMLDocument
+	{
+		public YAMLDocument()
+		{
+		}
+
+		public YAMLScalarNode CreateScalarRoot()
+		{
+			YAMLScalarNode root = new YAMLScalarNode();
+			Root = root;
+			return root;
+		}
+
+		public YAMLSequenceNode CreateSequenceRoot()
+		{
+			YAMLSequenceNode root = new YAMLSequenceNode();
+			Root = root;
+			return root;
+		}
+
+		public YAMLMappingNode CreateMappingRoot()
+		{
+			YAMLMappingNode root = new YAMLMappingNode();
+			Root = root;
+			return root;
+		}
+		
+		internal void Emit(Emitter emitter, bool isSeparator)
+		{
+			if(isSeparator)
+			{
+				emitter.Write("---").WriteWhitespace();
+			}
+
+			Root.Emit(emitter);
+		}
+
+		public YAMLNode Root { get; private set; }
+	}
+}