[nvim] func to add descriptions to keymap opts tables

nvim/lua/funcs.lua

@@ -6,3 +6,14 @@ function Contains(list, element)
   end
   return false
 end
+
+---comment
+---@param list table
+---@param key string
+---@param value any
+---@return table
+function Append(list, key, value)
+  local new_list = {unpack(list)}
+  new_list[key] = value
+  return new_list
+end