Update Keras README.md

hpvm/test/dnn_benchmarks/keras/README.md

-
 # Keras Frontend 
 
 Install Keras Frontend after moving to directory `/hpvm/hpvm/projects/keras`
@@ -165,6 +164,18 @@ translate_to_approxhpvm(model, data_dir, src_dir, test_data, test_labels, tune_d
 
 ```
 
+## Running HPVM Binary 
+
+Run the `HPVM_binary` generated under the directory specified by `src_dir` (described above). Usage: 
+
+```
+./HPVM_binary -t {test|tune} -c ${config_file_path}
+```
+
+`test|tune`: Runs with either tune (autotuning data) or test set (for evaluation)
+
+`config_file_path`: Path to an HPVM tensor configuration file (includes approximation settings)
+
 
 ## Automated Tests