Have never worked with repositories or pull request this is your chance to break into it!!
1.Fork the repository
2.Create your new file in the forked reposity
3.Add the codes and make the necessary changes in your forked repository
4.Commit to main Branch
5.Make the Pull Request to add the changes to the main repository
6.Wait for your Pull Request to be accepted
:) happie hacking .... lets add a silver lining to the umbrella