Can't create F# function

When I run `func new` the options only list C# and JavaScript. F# should be on the list
When I run `func new --language F# --template HttpTrigger --name MyHttpTrigger` the following error is reported:
`Can't find template "HttpTrigger" in "F#"`

Start by reproducing the issue with `func new` and with `func new --language F# --template HttpTrigger --name MyHttpTrigger`. Trace how the CLI lists languages and resolves the `HttpTrigger` template; done means F# appears in the options and the command creates the function without the reported template error.

Written by the indexing model from the issue text.