untested texture atlas pipeline system complete.

RecrownedAthenaeum.Pipeline/TextureAtlas/TextureAtlasWriter.cs

@@ -8,16 +8,18 @@ using System.Threading.Tasks;
 
 namespace RecrownedAthenaeum.Pipeline.TextureAtlas
 {
-    class TextureAtlasWriter : ContentTypeWriter<TextureAtlasFile>
+    [ContentTypeWriter]
+    class TextureAtlasWriter : ContentTypeWriter<byte[]>
     {
         public override string GetRuntimeReader(TargetPlatform targetPlatform)
         {
-            throw new NotImplementedException();
+            return "RecrownedAthenaeum.Pipeline, TextureAtlasDataReader";
         }
 
-        protected override void Write(ContentWriter output, TextureAtlasFile value)
+        protected override void Write(ContentWriter output, byte[] value)
         {
-            throw new NotImplementedException();
+            output.Write(value.Length);
+            output.Write(value);
         }
     }
 }