Deploy a library for arduino -- 2

The goal is to provide an example that demonstrates the deployment of an arduino library. You will get your library to print "helloworld" on the serial console. REQUIREMENT: The library must show in the Sketch:Include Library:Manage Libraries directory. REQUIREMENT: The library MUST have one example (at least) listed in the examples section REQUIREMENT: You must be able to make this work on a mac. REQUIREMENT: You have your own Arduino uno REQUIREMENT: You have deployed a library before REQUIREMENT: To show that you have read this description, please put in a link to the library you created in the past. REQUIREMENT: Your library should be shown in the library manager. Having the library show in the library manager is important for marketing our new hardware product.