Add a notice to the README in models/inception

inception/README.md

@@ -24,6 +24,11 @@ model architecture.
 
 ## Description of Code
 
+NOTE: For the most part, you will find a newer version of this code at [models/slim](https://github.com/tensorflow/models/tree/master/slim). In particular:
+
+*   `inception_train.py` and `imagenet_train.py` should no longer be used. The slim editions for running on multiple GPUs are the current best examples.
+*   `inception_distributed_train.py` and `imagenet_distributed_train.py` are still valid examples of distributed training.
+
 The code base provides three core binaries for:
 
 *   Training an Inception v3 network from scratch across multiple GPUs and/or