adding example files/hierarchy for HTTP ipxe

examples/HTTP/boot.php

@@ -0,0 +1,9 @@
+<?php
+print '#!ipxe
+
+cpuid --ext 29 && set bit_type 64 || set bit_type 32
+initrd example.${bit_type}.img
+kernel example.${bit_type}.kern initrd=example.${bit_type}.img ip=:::::eth0:dhcp archiso_http_srv=http://domain.tld/path/to/squashes/ archisobasedir=EXAMPLE archisolabel=EXAMPLE checksum=y
+boot
+'
+?>