Port NBT impl from LibAC Dart

NBT/EndTag.cs

@@ -0,0 +1,42 @@
+using System;
+using LibAC.NBT.API;
+
+namespace LibAC.NBT;
+
+public class EndTag : Tag
+{
+    public override TagType GetTagType()
+    {
+        return TagType.End;
+    }
+
+    public override void WriteValue(ByteLayer data)
+    {
+    }
+
+    public override void ReadValue(ByteLayer data)
+    {
+    }
+
+    public override dynamic GetValue()
+    {
+        return null;
+    }
+
+    public override void SetValue(dynamic val)
+    {
+    }
+
+    public override void WriteStringifiedValue(StringBuilder builder, int indent, bool isList)
+    {
+    }
+
+    public override void ReadStringifiedValue(StringReader reader)
+    {
+    }
+
+    public override void PrettyPrint(int indent, bool recurse)
+    {
+        Console.WriteLine($"{"".PadLeft(indent, '\t')}{Tag.GetCanonicalName(GetTagType())}");
+    }
+}