Ok, well, first off, no one can play on your map because you haven't included:
a) .bzn file.
b) .des file.
c) .vxt file.
d) .BMP file.
(I will use my map for examples)Only the first file (.bzn) is 100% vital to include in order for your map to work. The others aren't needed but it is a good idea to include them.
.bzn file is the mission file, and you get this by loading up your map in the editor then pressing CTRL + S. A window will then appear prompting you to save the map as a .bzn file. Do this first. When you have your .bzn file, drop it into your zip archive.

.des file is just a text document you can quickly make in Notepad. Include things like what world the map is on, the size of the map, are there any powerups?, geysers? etc. Basically just a description of your map. The text in your .des file will appear below the name of your map when you pick it from the list of maps in a game lobby. When you have made your .des file, place that into your zip archive.

The .vxt file is the file that controls what unit A player can spawn in, e.g. Czar, Grizzly, Flanker etc. If you are not bothered about what vehicle someone can spawn in, you can just use the default one which is called netveh.vxt. If are going to use netveh, explain that in your Read-Me so that people know to put that file in instead of trying to put in a .vxt that doesn't exist. If you want to make your own list of units, then use this list as a reference:
Code:
avtump
bvtump
bvltnk
bvraz
bvhraz
bvtank
avltnk
avltmp
ssuser
svtamp
svtank
avlamp
svfimp
svwamp
svhraz
avtank
asuser
svtump
avtam2
avfimp
avwalk
avwamp
avtamp
svltnk
avhrmp
svrckt
avrckt
Sorry but I'm not entirely sure which .odf corresponds to their correct unit. If you did make your own .vxt file, pop that into your zip archive.
Finally, the .BMP file. To find your .BMP file, go to addon, and search in "multst90.BMP". Copy-paste that file and drop it into your zip archive.
Here is a picture showing how I get my .BMP file from the addon folder for reference:

One thing I did notice is how your Read Me contained a few mistakes.
If you don't mind I quickly corrected them for you.
Before:
After:
P.S: I thought that Because I am a native English speaker (English being my 1st language) if I edited your Read Me I might be able to improve it a bit for you
