Add describeLead endpoint to service.json

[ghost]

I noticed that Marketo has a useful endpoint exposed via <REST API Endpoint URL>/rest/v1/leads/describe.json as described in MKTO Rest Docs.

The change set to implement this functionality would be very small. I would propose to add
"describeLead": { "httpMethod": "GET", "uri": "leads/describe.json" }, in service.json.

I'd be curious to see if this would be of use to others if we were to add it to the library.

[crankenheimer]

I'll second this request. We do use the library, and I have a use case for this today.