message: add description to xaynet-macros crate
diff: @@ -6,6 +6,7 @@ edition = "2018"
  license-file = "../../LICENSE"
  repository = "https://github.com/xaynetwork/xaynet/"
  homepage = "https://xaynet.dev/"
  +description = "Macros for internal use in `xaynet-server`"
  [dependencies]
  syn = "1.0.41"
  