1. Follow steps 1 & 2 of this guide:
http://www.saurik.com/id/7 (which was the first result for Googling "cydia repository", please search next time).
2. Contact the owner of the repository you'd like your package to appear in.
For future reference, this is a programming forum (says so up there in the title); for these sorts of topics please post in the iPhone Hacks forum:
https://forums.macrumors.com/forums/105/