add objectivec/test and objectivec/docs

objectivec/docs/jazzy_config.yaml

@@ -0,0 +1,15 @@
+module: ONNX Runtime Objective-C API
+author: ONNX Runtime Authors
+author_url: https://www.onnxruntime.ai
+github_url: https://github.com/microsoft/onnxruntime
+
+objc: true
+# Specify the training header as umbrella_header so that every public header is included.
+# The training header is a superset of the inference-only header.
+umbrella_header: ../include/onnxruntime_training.h
+framework_root: ..
+
+readme: ./main_page.md
+
+hide_documentation_coverage: true
+undocumented_text: ""