Update README.md

README.md

@@ -7,3 +7,5 @@ http://c-22021052-cmt-120-cw-2-git-app-c22021052-cmt120-cw2-portfolio.apps.opens
 This repository contains all the files needed to run C22021052's project.
 
 The password to enter the portfolio website is 'admin'.
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+Background image reference: Ch, A. (2018). Light Bulb on White Panel. [jpg] Available at: https://www.pexels.com/photo/light-bulb-on-white-panel-1166643/ [Accessed 23 Jan. 2023].