add ALv2 licenses (#1271)

Signed-off-by: Sheng Zha <[email protected]>

Author: szha

CONTRIBUTING.md

@@ -1,2 +1,4 @@
+rem SPDX-License-Identifier: Apache-2.0
+
 python -m pytest --cov=tf2onnx
 python setup.py bdist_wheel

LICENSE

@@ -1,9 +1,12 @@
 #!/bin/bash
 
+# SPDX-License-Identifier: Apache-2.0
+
+
 set -x
 
 apt-get install -y protobuf-compiler libprotoc-dev
-pip install setuptools 
+pip install setuptools
 pip install onnx pytest-cov
 
 python setup.py test

README.md

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 """
 The following code compares the speed of tensorflow against onnxruntime
 with a model downloaded from Tensorflow Hub.

Troubleshooting.md

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 """
 A simple example how to call tensorflow-onnx via python.
 """

build.bat

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 """
 A simple example how to map a custom op in python.
 """

build.sh

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 """
 This example retrieves a model from tensorflowhub.
 It is converted into ONNX. Predictions are compared to