See the packaging guide on how to do it properly - the files should be in "packages/base" for starters.
You've named your files with uppercase letters - don't - "deathmaster" is better than "DeathMaster" for cross-platform compatibility and ease of use when using tab-completion!
Also - please remove the "__MACOSX" directory : it just bloats the ZIP and nobody needs it.

Regarding the map: mmh, the layout is unimaginative - it's classic, but you didn't really do anything with it IMHO, not that my own variant (Ithaqua's Arena) is much better, but it's nearly 3 years old - at that time there wasn't a basic arena so I felt justified in posting it then, I wouldn't now.
To finish it off you've made the one cardinal mistake I really can't understand with beginning mappers - 90% of them do it though - you've made most of your corridors so narrow that you can't get past each other, no manouvers possible, it's run-and-die .. there's virtually no chance that you'd pass through one of them on a busy server!

corridors are all too narrow and you can get the enemy flag way too fast.

i mean.. do those new mappers even test their own maps? i guess no ~.~

I should get around to it after i've finished my SP map i'm working on.