Added VM Hardening Guide

VMware has certainly improved its online resources for securing their product infrastructure, including high level explanations, white papers, and finally technical guides. However, VMware has yet to provide a central, definitive guide on what users can do to harden individual VMs by modifying the VM configuration file. Instead, users have to jump through various knowledge base articles and community posts to obtain them. As such, I've created a VM Hardening Guide which distills these settings that were published by VMware as well as by third party sources.