code: public Observable<ProjectFileInner> createOrUpdateAsync(String groupName, String serviceName, String projectName, String fileName, ProjectFileInner parameters) {
          return createOrUpdateWithServiceResponseAsync(groupName, serviceName, projectName, fileName, parameters).map(new Func1<ServiceResponse<ProjectFileInner>, ProjectFileInner>() {
              @Override
              public ProjectFileInner call(ServiceResponse<ProjectFileInner> response) {
                  return response.body();
              }
          });
      }
docs: Create a file resource.
  The PUT method creates a new file or updates an existing one.
  
  @param groupName Name of the resource group
  @param serviceName Name of the service
  @param projectName Name of the project
  @param fileName Name of the File
  @param parameters Information about the file
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ProjectFileInner object