Contributing: Add tutorial for setting up email and user name on GitHub

[andreia-oca]

Adding a tutotial to set email and name for GitHub.

[teodutu]

Thanks for the contribution. Here's how to make this better:

• To link the PR automatically with guide: Add tutorial for setting up email and user name on GitHub and locally in git #341, add the text fixes #341 anywhere in the commit or PR message.
• To fix spellcheck, you need to add the false positive words to these wordlist (make sure to keep them sorted): https://github.com/open-education-hub/actions/tree/main/spellcheck/config

[teodutu]

Suggested change

	If you prefer to set this information only for the current repository, omit the --global flag:
	If you prefer to set this information only for the current repository, omit the `--global` flag:

[Alex-deVis]

Suggested change

	To avoid common issues with authorship verification (such as `checkpatch` errors](https://github.com/open-education-hub/operating-systems/actions/runs/6590761580/job/17908015178?pr=339#step:3:570)), it is important to make sure that your `git` configuration includes the correct name and email address, matching the ones associated with your GitHub account.
	To avoid common issues with authorship verification (such as [`checkpatch` errors](https://github.com/open-education-hub/operating-systems/actions/runs/6590761580/job/17908015178?pr=339#step:3:570)), it is important to make sure that your `git` configuration includes the correct name and email address, matching the ones associated with your GitHub account.

You should've deleted only the closing bracket, now the link is broken.