Adding Sierra's employee and product

Added siyee to Staff.java and Tulips to Products.java, also added Bear.jpg and tulips.jpg to the staff and product folders in images respectively.

added 9 commits

• e399a637...0aed0969 - 8 commits from branch main
• ad644318 - Merge main to make sure everything is up to date

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added 6 commits

• ad644318...6740314b - 5 commits from branch main
• 48100850 - Merge branch 'main' into siyee_staff_page to get new changes

Compare with previous version

mentioned in commit faab7352

merged