Update Keras README to include conda step

hpvm/projects/keras/README.md

@@ -5,6 +5,21 @@
 * python == 3.6.x
 * pip >= 9
 
+If your system uses a different Python version, we recommend using the conda environment `keras_python36.yml`. Install this using:
+
+```
+conda env create -f keras_python36.yml --name keras_python36
+```
+
+Activate the conda environment before installing the pip package (below) using:
+
+```
+conda activate keras_python36
+```
+
+**NOTE:** This step must be performed each time (for each shell process) the frontend is to be used.
+
+
 ## Installing the Keras Frontend Package
 
 At the root of this project (`/projects/keras/`) install the Keras frontend pip package as:
@@ -13,6 +28,8 @@ At the root of this project (`/projects/keras/`) install the Keras frontend pip
 pip install -e .
 ```
 
+**NOTE:** If you are using the conda environment, activate it prior to this step.
+
 ## Keras Benchmarks 
 
 Keras benchmarks can be found [here](https://gitlab.engr.illinois.edu/llvm/hpvm/-/tree/approx_hpvm_reorg_keras/hpvm/test/dnn_benchmarks/keras)