Update Keras README.md

hpvm/test/dnn_benchmarks/keras/README.md

@@ -111,6 +111,20 @@ These are described here:
 Trains the Keras model constructed in `buildModel` and is expected to return the 
 trained keras model - training parameters should be tuned here.
 
+### Directly using Keras Frontend API
+
+Alternate to extending the `Benchmark` class, users may directly invoke the Keras Frontend API. This can be done as:
+
+```python
+
+from keras_frontend.approxhpvm_translator import translate_to_approxhpvm
+
+# Construct and train your Keras Model (or load pre-trained weights)
+
+translate_to_approxhpvm(model, data_dir, src_dir, test_data, test_labels, tune_data, tune_labels, batch_size, num_classes)
+
+```
+
 
 ## Automated Tests