use cocoapods xcodeproj gem to add a file to your xcode project from the command line

add_bundle.rb

require 'xcodeproj'

project_path = "./platforms/ios/helloWorld.xcodeproj"
project = Xcodeproj::Project.open(project_path)

#add the bundle as a reference
bundle_path = "../../includes/OTABundle.bundle"

bundleRef = project.new_file(bundle_path);

# Get the `copy files` build phase
buildphase = project.objects.select{|x| x.class == Xcodeproj::Project::Object::PBXResourcesBuildPhase}[0];

#add the bundle to the build phase
buildphase.add_file_reference(bundleRef);

project.save()