Update README

Author: sotanmochi

Assets/CustomTextureRenderer/README.md

@@ -3,6 +3,21 @@
 A graphics utility to update textures from native plugins.  
 The function for updating textures runs on Unity's Render Thread or another thread.
 
+IL2CPP is currently not supported.
+```
+NotSupportedException: IL2CPP does not support marshaling delegates that point to instance methods to native code.
+The method we're attempting to marshal is: UnityCustomTextureRenderer.CustomTextureRenderer::TextureUpdateCallback
+UnityCustomTextureRenderer.CustomTextureRenderer.Update () (at <00000000000000000000000000000000>:0)
+UnityCustomTextureRenderer.Samples.Test.Update () (at <00000000000000000000000000000000>:0)
+```
+```
+NotSupportedException: 
+IL2CPP does not support marshaling delegates that point to instance methods to native code.
+The method we're attempting to marshal is: UnityCustomTextureRenderer.NonBlockingCustomTextureRenderer::TextureUpdateCallback
+UnityCustomTextureRenderer.NonBlockingCustomTextureRenderer.Update () (at <00000000000000000000000000000000>:0)
+UnityCustomTextureRenderer.Samples.Test.Update () (at <00000000000000000000000000000000>:0)
+```
+
 ## Tested Environment
 - Unity 2020.3.27f1
 - Windows 10

README.md

@@ -3,6 +3,21 @@
 A graphics utility to update textures from native plugins.  
 The function for updating textures runs on Unity's Render Thread or another thread.
 
+IL2CPP is currently not supported.
+```
+NotSupportedException: IL2CPP does not support marshaling delegates that point to instance methods to native code.
+The method we're attempting to marshal is: UnityCustomTextureRenderer.CustomTextureRenderer::TextureUpdateCallback
+UnityCustomTextureRenderer.CustomTextureRenderer.Update () (at <00000000000000000000000000000000>:0)
+UnityCustomTextureRenderer.Samples.Test.Update () (at <00000000000000000000000000000000>:0)
+```
+```
+NotSupportedException: 
+IL2CPP does not support marshaling delegates that point to instance methods to native code.
+The method we're attempting to marshal is: UnityCustomTextureRenderer.NonBlockingCustomTextureRenderer::TextureUpdateCallback
+UnityCustomTextureRenderer.NonBlockingCustomTextureRenderer.Update () (at <00000000000000000000000000000000>:0)
+UnityCustomTextureRenderer.Samples.Test.Update () (at <00000000000000000000000000000000>:0)
+```
+
 ## Tested Environment
 - Unity 2020.3.27f1
 - Windows 10