You have most likely chosen to create your repository with a README.md file and that is why it requested a pull first. Either way, the pull operation cannot delete your project and if there was a README.md already in this project, it would have been indicated as conflict that you should resolve manually. So, in short, we're not sure what has gone wrong with your project, but a pull/push operation cannot cause the damage you refer to.
If you already had commits in your project, you can use the History to rollback to a previous state of your repository. If not, we would need the name of your project and the date from which you want the backup.
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