I am new at this map uploading thing so I am not quite sure what goes in here.
I believe it is something like this:

build time: 4-8 hours
contents: DM-MCore.ut2, Readme.txt
installation: put DM-MCore.ut2 in your UT2003\maps folder
comments: This is not my first Unreal map, but it is my first UT2003 map and I just basically slapped it together. If you hate it, please don't flame me. Just say the quick time of the build really shows.

That is all I know of for the readme. Please, if you know of more readme content, say so in your posted comments.