If you want your mod to be available in the 0 A.D. mod downloader, you need to follow these steps.
1) Prepare your mod as explained in the Modding Guide. You should end up with a .zip file. If you created a .pyromod file, copy it and rename the copy to modname.zip so it can be uploaded on mod.io.
2) Sign up or login on mod.io. Go to Mods > Add Mod, and specify 0 A.D. in the field Game. Add all the information you want to make available for visitors. Complete the submission steps unt
Common Mistakes:
name/label confusion in mod.json - for instance https://0ad.mod.io/ja-lang
"name" should be a lowercase identifier, it usually matches the URL of your mod on mod.io: for instance "ja-lang"
"label" is a human-readable name, it usually matches the title of the mod on mod.io: for instance "Japanese Language Pack"
top-level extra directory. Your zip should contain directly mod.json and the rest of the files, it should not contain a sub-directo