add objectivec/test and objectivec/docs

objectivec/test/testdata/gen_models.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e
+
+# Get directory this script is in
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+cd ${DIR}
+
+python3 ./single_add_gen.py
+
+ORT_CONVERT_ONNX_MODELS_TO_ORT_OPTIMIZATION_LEVEL=basic python3 -m onnxruntime.tools.convert_onnx_models_to_ort --optimization_style=Fixed .

objectivec/test/testdata/single_add_gen.py

@@ -0,0 +1,19 @@
+import onnx
+from onnx import TensorProto, helper
+
+graph = helper.make_graph(
+    [  # nodes
+        helper.make_node("Add", ["A", "B"], ["C"], "Add"),
+    ],
+    "SingleAdd",  # name
+    [  # inputs
+        helper.make_tensor_value_info("A", TensorProto.FLOAT, [1]),
+        helper.make_tensor_value_info("B", TensorProto.FLOAT, [1]),
+    ],
+    [  # outputs
+        helper.make_tensor_value_info("C", TensorProto.FLOAT, [1]),
+    ],
+)
+
+model = helper.make_model(graph, opset_imports=[helper.make_opsetid("", 12)])
+onnx.save(model, r"single_add.onnx")