MacOS renting and configuration guide

[riccardobl]

Article that explains how to rent and configure mac os for development with jme. Useful for people looking to support macos without investing money into the hardware necessary for testing. Forum post: https://hub.jmonkeyengine.org/t/macos-renting-in-the-cloud-links-and-guide-for-quick-setup/45261

[stephengold]

I haven't tested these procedures, but I wholeheartedly support posting them to the blog.