add a description field to modules

lua/dep/modules/module.lua

@@ -3,6 +3,7 @@ local packager = require("dep.package")
 
 ---@class module
 ---@field name string name of the module
+---@field desc string description of the module
 ---@field path string path to the module
 ---@field mod table the module
 local module = {}
@@ -22,6 +23,7 @@ function module:new(modpath, prefix, overrides)
   setmetatable(o, self)
 
   o.name = "<unnamed module>"
+  o.desc = "<undescribed module>"
   if type(modpath) == "string" then
     if prefix ~= nil then
       if prefix:sub(#prefix) ~= "." and modpath:sub(1, 2) ~= "." then
@@ -38,6 +40,7 @@ function module:new(modpath, prefix, overrides)
     end
   end
   o.name = o.mod.name or o.name
+  o.desc = o.mod.desc or o.desc
 
   -- allow a module to be a spec
   if spec_man.check(o.mod, true) ~= false then