Create README.md

Author: srohit0

test/compiler/README.md

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+# deepC compiler tests
+
+## Use Model
+
+```onnx2exe model.onnx```
+
+1. *bundleDir :* dirname("generated exe, i.e. a.out or model.exe");
+1. *parameter file(s) :* in bundleDir
+1. input     file(s) :* with a path relative to current dir.
+1. *output    file(s) :* in current dir
+
+## Example
+
+```onnx2cpp mnist.onnx```
+
+```console
+> reading onnx model from file  mnist.onnx
+> Model info:
+>  ir_vesion :  4 
+>   doc       : 
+> INFO (ONNX): writing model parameter fc.bias to dir ..
+> INFO (ONNX): writing model parameter fc.weight to dir ..
+> INFO (ONNX): writing model parameter fc2.bias to dir ..
+> INFO (ONNX): writing model parameter fc2.weight to dir ..
+> running DNNC graph sanity check.
+> Writing intermediate file  ./mnist.cpp
+> Compiling ...
+> INFO (ONNX): model files are ready in dir .
+```