New portfolio_description

[maurolepore]

Follow up on https://github.com/2DegreesInvesting/r2dii.analysis/pull/10#issuecomment-566047068

portfolio_description.R

#' Description of a generic equity or debt portfolio dataset
#'
#' A equity or debt portfolio mapped to the physical assets of financial securities issuers.
#' The PACTA methodology is applied to the mapped data to produce a results file with
#' the portfolio's relative alignment with different climate scenarios for
#' technologies in climate-relavent sectors. The portfolio results
#' include the emissions factors and the absolute and scaled production
#' associated with the portfolio's exposure to each technology in climate-relavent sectors.
#'
#'
#' @name results_portfolio_description
#' @seealso [data_dictionary]
#' @family generic datasets
#' @examples
#' library(dplyr)
#'
#' data_dictionary() %>%
#'   filter(dataset == "results_portfolio")
NULL