LeNet on MNIST + readme update (#12)

* LeNet on MNIST + readme update

* tanh + remove device toggle

* remove device entirely

README.md

@@ -1,37 +1,20 @@
 # MLX Swift Examples
 
-Example [mlx-swift](https://github.com/ml-explore/mlx-swift) programs.
+Example [MLX Swift](https://github.com/ml-explore/mlx-swift) programs.
 
-## MNISTTrainer
+- [MNISTTrainer](Applications/MNISTTrainer/README.md): An example that runs on
+  both iOS and macOS that downloads MNIST training data and trains a
+  [LeNet](https://en.wikipedia.org/wiki/LeNet). 
 
-An example that runs on both iOS and macOS that downloads MNIST training
-data and trains an MNIST model.
+- [LLMEval](Applications/LLMEval/README.md): An example that runs on both iOS
+  and macOS that downloads an LLM and tokenizer from Hugging Face and  and
+  generates text from a given prompt. 
 
-- [README](Applications/MNISTTrainer/README.md)
+- [LinearModelTraining](Tools/LinearModelTraining/README.md): An example that
+  trains a simple linear model.
 
-## LLMEval
-
-An example that runs on both iOS and macOS that downloads a LLM model
-weights and tokenizer configuration from Hugging Face and evaluates
-a prompt in-process.
-
-- [README](Applications/LLMEval/README.md)
-
-## LinearModelTraining
-
-A simple linear model and a training loop.
-
-- [README](Tools/LinearModelTraining/README.md)
-
-## llm-tool
-
-A command line tool for generating text using a variety of Hugging Face models:
-
-- [README](Tools/llm-tool/README.md)
-
-## mnist-tool
-
-A command line tool for training an MNIST (MLP) model:
-
-- [README](Tools/mnist-tool/README.md)
+- [llm-tool](Tools/llm-tool/README.md): A command line tool for generating text
+  using a variety of LLMs available on the Hugging Face hub.
 
+- [mnist-tool](Tools/mnist-tool/README.md): A command line tool for training a
+  a LeNet on MNIST.