Update README with community message (#3903)

Author: scotts

README.md

@@ -7,6 +7,16 @@ torchaudio: an audio library for PyTorch
 
 ![TorchAudio Logo](docs/source/_static/img/logo.png)
 
+> [!NOTE]
+> **We are in the process of refactoring TorchAudio and transitioning it into a
+>  maintenance phase. This process will include removing some user-facing
+>  features. Our main goals are to reduce redundancies with the rest of the
+>  PyTorch ecosystem, make it easier to maintain, and create a version of
+>  TorchAudio that is more tightly scoped to its strengths: processing audio
+>  data for ML. Please see
+>  [our community message](https://github.com/pytorch/audio/issues/3902)
+>  for more details.**
+
 The aim of torchaudio is to apply [PyTorch](https://github.com/pytorch/pytorch) to
 the audio domain. By supporting PyTorch, torchaudio follows the same philosophy
 of providing strong GPU acceleration, having a focus on trainable features through