Playing MP3 without Login

first of all: Sorry for my bad english! ;-)

I am new to Elgg and I have 2 questions:
1. Is there an offline-documentation for Elgg-Programming?

2. I'm displaying on my start-site links to uploades mp3-files.
    I want the user to be able to play a mp3 on the start-site without being logged in.
    How can I do this?

Thank You And Many Greetings from Germany

Beginning Developers

Beginning Developers

This space is for newcomers, who wish to build a new plugin or to customize an existing one to their liking