Additional wiki pages - Githubissues

Capturing some additional wiki pages that we can use to make things easier for our customers.

Information on what is supported in docker, an Azure based VM and on-premises hardware
- Used for when a new OS is requested - so they know what type of system to expect and how long it will take to get the new OS onboarded.
Wiki to explain what the various queue designations are and how/why we use them.
- This wiki may already exist, but I've gotten several questions about this recently.

dotnet / dnceng