metasploit-gs/docs/metasploit-framework.wiki/Powershell-Extension.md

I'm yet to get the documentation done for this extension, but in the mean time there's some useful information in the [original payloads pull request](https://github.com/rapid7/metasploit-payloads/pull/89) that shows how it can be used (including bindings).

I promise to get more detail here soon!