title: Pull request from a different repository
body: <p>I didn't know how forks and clones work. So in order to copy someone else's repo and work on it, I downloaded the repo's files (using no source control), created my own new repository, and then committed those files to it.</p>
  <p>I want to pull request my repo's master to the original repo, but I can't because it's not a fork. Furthermore - git doesn't even know that they originate from the same source, and hence if I checkout the original repo, open a new fork, copy-paste all the files from my private repo to the new fork, and pull request it back in, it will show it as a single giant commit, and I'll lose all of the commit and comment history on the old repo, which will be terrible.</p>
  <p>Is there a way for me to pull request my changes back into the original repo without losing all the history of my copied repo?</p>