Created read me document for thresholded relu example

example-prjs/thresholded_relu/README.md

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+This is small thresholded relu 1 layer example. To run it:
+1. Run the run_catapult.sh script.
+2. Replace the thresholded_relu_test.cpp in the my-Catapult-test with the thresholded_relu_test.cpp a level up (if you would like the testbench to be self-checking).
+3. Move tb_input_features.dat and tb_output_predictions.dat to my-Catapult-test/tb_data (if you want two pre-computed examples).
+
+Note: You can create your own array and get the predictions by editing then running thresholded_relu.py.