Revert "remove not required files"

This reverts commit 071c82ffd7.

objectivec/ort_env.mm

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#import "ort_env_internal.h"
+
+#include <optional>
+
+#import "cxx_api.h"
+
+#import "error_utils.h"
+#import "ort_enums_internal.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSString* ORTVersion(void) {
+  std::string result = OrtGetApiBase()->GetVersionString();
+  return [NSString stringWithUTF8String:result.c_str()];
+}
+
+@implementation ORTEnv {
+  std::optional<Ort::Env> _env;
+}
+
+- (nullable instancetype)initWithLoggingLevel:(ORTLoggingLevel)loggingLevel
+                                        error:(NSError**)error {
+  if ((self = [super init]) == nil) {
+    return nil;
+  }
+
+  try {
+    const auto CAPILoggingLevel = PublicToCAPILoggingLevel(loggingLevel);
+    _env = Ort::Env{CAPILoggingLevel};
+    return self;
+  }
+  ORT_OBJC_API_IMPL_CATCH_RETURNING_NULLABLE(error)
+}
+
+- (Ort::Env&)CXXAPIOrtEnv {
+  return *_env;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END