Consider providing an FAQ

[kamilkosek]

Hi,
I was browsing through some issues and saw a lot of them where people were asking the same things:

• Is PSReadLine Supported ?

• What it is all about with the Terminals (powershell, PowerShell Integrated Console)?

• Why is Code Folding so weird ?
  etc...
  What you guys think about it ?

[rkeithhill]

Great idea. This is a start. And it needs to be linked to from the README.md file. https://github.com/PowerShell/vscode-powershell/wiki/FAQ