add package license and description

mix.exs

@@ -5,6 +5,8 @@ defmodule FeedReader.MixProject do
     [
       app: :feed_reader,
       version: "0.1.0",
+      licenses: ["Apache-2.0"],
+      description: description(),
       elixir: "~> 1.20.4",
       elixirc_paths: elixirc_paths(Mix.env()),
       test_coverage: [ignore_modules: [~r/^FeedReader\.TestSupport\./]],
@@ -38,6 +40,11 @@ defmodule FeedReader.MixProject do
     ]
   end
 
+  defp description,
+    do: """
+    FeedReader is an Elixir library for fetching and parsing RSS, Atom, and RDF feeds. It supports local files, binaries, streams, and remote URLs.
+    """
+
   defp aliases do
     [
       precommit: [