Add get lenses endpoint
We need two steps here. First, an endpoint to query a list of lenses, then another request to process the actual doc. This is that first step. It addresses, but does not close #43 (closed)
We need two steps here. First, an endpoint to query a list of lenses, then another request to process the actual doc. This is that first step. It addresses, but does not close #43 (closed)