Add TODO: for unmanaged pixel copying [skip ci]

Former-commit-id: 45772bc399b25280ea79cd5afc081945b45808a8
Former-commit-id: f14063e037c5cc3c7bd2d1e9c0abf6d7413034dd
Former-commit-id: 7f4addaec89fea153275167ac093716192995108

src/ImageProcessorCore/PixelAccessor.cs

@@ -63,6 +63,9 @@ namespace ImageProcessorCore
             {
                 fixed (float* pbuffer = image.Pixels)
                 {
+                    // TODO: This isn't actually copying. 
+                    // We need to allocate and copy the pixels into unmanaged memory.
+                    // Will need to research how to do this.
                     this.pixelsBase = pbuffer;
                 }
             }