FEATURE REQUEST: Add documentation about Chocolatey Simple Server co-existance

[bcurran3]

(from https://github.com/chocolatey/simple-server/issues/26)

The current "Setup Normally" documentation states "Disable or remove the Default website" It should be noted why; or more importantly how to make Chocolatey Simple Server coexist with pre-existing production web servers. I tested and now am using on a new IIS installation I'm sure a lot of people don't want to setup a new server just for Chocolatey Simple Server if they don't need to.