add hashfile

[bkarli]

No description provided.

[vogti]

The hash seems to be unknown. Did you use your university mail address?

[bkarli]

Yes I did. Using zsh the hash created is not in the in the hashes.txt file. I've seen that you already made a change in the submit.sh script prompting the user to use bash. Using bash the outcoming hash is indeed in the file. So I'll make another commit.

[vogti]

It is interesting that the hash differs depending on the Shell being used, especially that zsh vs. bash makes a difference. However, the script has a hashbang indicating that it should be executed using bash.

The hash is now valid, but you have deleted the .gitkeep file. Please undo this and it should be fine to merge.