Update documentation with DocC Feature Branch Tutorial

[Jakayus]

What it Does

• Closes #216
• This adds a DocC interactive tutorial to describe updating a feature branch which can be helpful during the PR process.

How I Tested

• Add a list of steps to show the functionality of your feature For example:
• Build Software (to verify no new Swift Lint changes)
• Build the Documentation by going to Product -> Build Documentation
• A new window with the Basic-Car-Maintenance Documentation comes up - there is now a new section called "Updating Feature Branch" that follows the "How to Contribute to this Project" section. Both are within the "Getting Started" Chapter.

Notes

• If the documentation grows more extensive, we may want to consider splitting the images folder into chapters or sections.

Screenshot

Sample screenshots of documentation generated.

<img width="835" alt="feature_branch_doc_1" src="https://github.com/mikaelacaron/Basic-Car-Maintenance/asse

ts/6628293/5d425414-e307-4651-ad7c-d842e69db923">