Update index.md

Author: whiletruelearn

content/projects/index.md

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 These are some of the open/inner source projects that I have built/worked on.
 
+# [Libris.fm](https://apps.apple.com/us/app/libris-fm-free-audiobooks/id6744654703)
+
+Libris.fm - An iOS app to listen to public domain audio books.
+
 # [HN Client app](https://apps.apple.com/us/app/feedly-for-hackernews/id6744145932)
 
 A client app for reading HN on the go.