It's a very terrible exprience caused by unknown of the rules of Arch package guidelines!
It can only be lowercase!
In front of the beginning, you shoud follow this wiki for your authority! AUR_submission_guidelines
git -c init.defaultbranch=master clone ssh://aur@aur.archlinux.org/$YourPackageName.git
If there is warnning that git-upload-pack: invalid repository name , you should go back to AUR_submission_guidelines!
All is in sort! now you can make your PKGBUILD!
Just publish it!
makepkg --printsrcinfo > .SRCINFO
git add PKGBUILD .SRCINFO
git commit -m $UsefulCommitMessage
git push