Suggestion: Add link to "Akemi" in images folder

Just add a link to additional images. One may could also add this to the wiki but in my opinion the images folder is a good location for this information.

images/Readme.md

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+### Additional Logos
+
+Additional awesome logos for WLED can be found here [Aircoookie/Akemi](https://github.com/Aircoookie/Akemi).
+
+<img src="https://github.com/Aircoookie/Akemi/blob/master/akemi/001_cheerful.png">