Installation up to Syslinux boot loader finished
Added a tiny thread example

Demonstrates that the thread writes "Done" after the main loop writes "1".
Updated Readme, added webserver-test script

Example output from ./webserver-thread-test.pl using "curl http://vboxhost:8080/flkasdlfk" and similar:

Program started.
Embedded web server started.
Server address: 0.0.0.0
Server port: 8080
Processing request.
URI: /flkasdlfk
URL: /flkasdlfk
Processing request.
URI: /flkasdlfk/slsdfksd
URL: /flkasdlfk/slsdfksd
Perl exited with active threads:
    1 running and unjoined
    0 finished and unjoined
    0 running and detached