Add Gulano Cup #5 tournament article

[Reihynn]

addition of the Gulano Cup #5 tournament wiki page

[github-actions]

Thank you for contributing to the osu! wiki.

Please take note of the following:

• Make sure you've read this self-check checklist.

• Translations that have not been reviewed by a native speaker will be merged after a minimum of 1 week. If there are no reviewers for your language, please mention it explicitly.

• Refrain from spamming the Update branch button. A maintainer will do this before merging anyway.

• Apply review suggestions in batches from the Files changed tab like this:

  

See the contribution guide for more information.

All changes are run through continuous integration checks, which provide automatic detection of common errors. If you need help with decrypting CI check error messages, or with any other issues, ask in the #osu-wiki channel on the osu! Discord server.

[Reihynn]

eh kepencet

[Nivalyx]

looks alright at a glance for me (except for the formatting)

i think from here @Walavouchey should be able to take things away for merging

[TicClick]

LGTM with one comment