Uupdate package description

Author: hasufell

filepath.cabal

@@ -44,6 +44,10 @@ description:
   .
   "System.OsString" is like "System.OsPath", but more general purpose. Refer to the documentation of
   those modules for more information.
+  .
+  An introduction into the new API can be found in this
+  <https://hasufell.github.io/posts/2022-06-29-fixing-haskell-filepaths.html blog post>.
+  Code examples for the new API can be found <https://github.com/hasufell/filepath-examples here>.
 
 extra-source-files:
   Generate.hs