add objectivec/test and objectivec/docs

objectivec/test/test_utils.h

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#import <Foundation/Foundation.h>
+#import <XCTest/XCTest.h>
+
+#import "ort_session.h"
+#import "ort_env.h"
+#import "ort_value.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+namespace test_utils {
+
+NSString* _Nullable createTemporaryDirectory(XCTestCase* testCase);
+
+NSArray<NSNumber*>* getFloatArrayFromData(NSData* data);
+
+}  // namespace test_utils
+
+NS_ASSUME_NONNULL_END